From bad service to pathetic service!

On the 21st of december 2017 cellc wrongfully debited my account without my authority to debit! It was later agreed that it was done without my consent and that they would provide me with a letter to give my bank due to the fact that the debit went unpaid as i get paid on the 25th! It is now 2 weeks later and still i am sitting with no letter and just a messed up bank account! I called but still no letter has been sent! Cheap rates to match their cheap customer service!