I can raise you on that 
Last year GLS refused to deliver a mattress from Lidl. They’d proposed a date and I’d selected another one. They confirmed by email for the new date but didn’t turn up. There was just no comms, no response to any query, no info.
Delivery promise was 5 days, 10 if they claimed an exception.
After trying to receive my mattress for 22 days, I cancelled it invoking my right to cancel due to non-delivery and requested a prompt refund. Lidl Customer Services accepted this, and said they had sent the refund instruction to their responsible department while we were on the phone.
Late afternoon 5 days later I returned home in a thunderstorm having been out since 7am.
I couldn’t open the gate. Because a large cardboard box containing a mattress had been tossed over the gate into wet-for-days thigh height
grass behind it. And was just lying there with torrential rain falling onto it.
Phoned Lidl told them it was cancelled 5 days ago and a refund already agreed, and said no prenotificarion of delivery, and I rejected it. Mentioned tossed into wet grass rained on all day if I had been there I would have rejected it and was calling them immediately I’d returned and found it.
Told them to collect it immediately, and I still wanted my refund, the package was rejected and would stay in the position their deliverer had left it until collected, from now until they collected it. Frankly no one would have accepted a mattress delivered in that state under any circumstances.
Told them to collect it immediately and it was now left as it had been delivered, under the elements exactly as their deliverer had left it. (photographed extensively and photos kept).
It was left there about 21 days in total uncollected despite chasing. I only got a call from someone who tersely said they were a manager but not from which firm Lidl? GLS? another deliverer? and arranged a time for collection the following day.
This was only after I finally sent Lidl Legal Dept a formal Mise en Demeure email. Giving them 14 days to collect their mattress from where it had been left behind my gate by their deliverer stating if not collected by then I would donate it to Emmaüs or a similar charity.
I reminded them it had been sitting out in the weather for 21 days exactly as it had been delivered. Of course I had actually done a bit better than that having found a platform to put it on and a serious tarp to cover it but it was incredibly stressful.
Meanwhile while all this was going on, Lidl had not refunded me as agreed the day I had cancelled. They still didn’t until 2 or so weeks after the mattress was finally collected. Clearly they were treating it as a return (stvp1d 1d10ts) and were waiting to get the product back.
After they refunded me (clearly only triggered by them getting the mattress back 2 more weeks later despite the fact that it had been cancelled 5 days before it was suddenly delivered anyway without notice) I called to request the statutory % of price to be refunded extra. As they had not refunded me till well over 30 days after the cancellation. This is a legal right, it’s 10% or 15% for any refund not made within x days and is due in cash. They tried to fob me off with a voucher with restrictions on it and actually worth less net. I reminded them of my right to it in cash and requested the amount due in cash.
Not that the amount is huge. It’s more the enormous timewasting and stress (were they going to try to argue the condition of the mattress? why did they not refund promptly as agreed?) they put me through.
At that point Customer Services hung up on me. As soon as I can afford a subscription to Que Choisir, which gives free advice on up to 4 consumer legal matters per year, I shall write to Lidl formally and will push it to the Répression des Fraudes if necessary.
