Travel scam

We were called yesterday and told we had won a holiday for eight days because our telephone number ended in 32.
I took details but couldn’t find Mondo travel in Paris.
There is a genuine Mondo travel group in Australia and New Zealand and I contacted them to see if they knew anything about it, but was mailed back to say someone else had contacted them and it seemed to be a scam of some sort.
Never mind, a useful contact made for the gite.
I cannot understand how it works if you cannot find them, strange.