EDF has an English speaking helpline, their English is perfect, they are polite, and you will receive a response fairly promptly.
However in my experience their customer SERVICE is diabolical.
EDF have inflated my monthly direct debits payments, changed the monthly plan to increase the payments with no justification or consultation. Failed to provide me with any details of my (gas) consumption over the last 10 months (in spite of having a smart meter). Failed to refund a 900 euro overpayment. In my opinion, a company to be avoided.
I now use Mint to supply my electricity. Mint email me weekly with details of my daily consumption over the last 2 weeks.
I used Selectra https://selectra.info/ to organise my transfer from EDF to Mint.
Selectra has English speaking advisors.