What a useless bunch

We made the terrible mistake by signing up with Virgin Mobile on a contract. From day one we had problems, mainly network reception but then also billing, data etc. My son, who uses the account, could not continue any longer and signed a new contract with Vodacom. He has not used his Virgin Mobile account for the month of March, yet the account is high. He went in to them now to get a printout so we can see why it is high and they said we can only get February and March's usage at the end of April??? Really!!! We also changed banks and they confirmed that from the 1st April the debit order would go off the new account, needless to say it did not. My son went in now with a letter from me with new banking details and the proof I had from my banker that they said it was changed and they said it had not been changed and now they have. This is so pathetic!! The problem I have is that we are closing our old bank account, so if they once again slip up, payment will not go off. Secondly, why are we being charged so much even with not using the sim, and thirdly why is your service so shocking???