I am moving out of France and I will be closing my French bank account (which pays for my mobile subscription) in two days.

1. How can I terminate my contract after the 12th month (30 Aug 2019)? I cannot find the option on my Mobile app.
2. How can I prepay for the fees before closing the French Bank account? I tried changing the card with a non-French bank but it doesn't work.

Please help, thank you!