Cellc lack of customer service

I am really upset and disappointed.... As I was black listed due to cellc not taking the debit order for 5months and with out contacting me first to ask why it wasn't paid they black listed me.... December was meant to be last payment to be done with the black listing and again the didn't take the debit order again . And when I contacted them eventually getting to the right people after phone 3 diffrent companies (NO ONE EVEN CELLC CAN FIND MY ACCOUNT) They have now been telling me since the 7th that the legal department will get back to me and on the 27 of the month still nothing..... Thier service is terrible and very unprofessional .... They are quick to black list people for thier own mistake but they take for ever to help and rectifie what they have done..... Now my name is bad because of them company and all they doing is saying I must wait because they are back logged ( which is not my problem) all I wanted is my paid up letter and my name off experian ITS NOT THAT DIFFICULT !!!!!!!!