Telkomza bad service

Good day. I've got a contract with Telkom and a signed agreement of a debit order which goes off every month by the 30th from my bank account. Since the 1st of June I've been experiencing problems with them, which I feel that i am not liable for. The debit order for May was never taken off my account. I then received demands for payment If you skip one installment, you have to pay the outstanding money plus an extra cost which is the same as your installment.(double) I went to one of their branches to lay a complaint to no avail. The guy showed me that there was no funds in my account on the 21st June 2020. My agreement is for the 30th and not the 21st. I then made an eft payment on the 10th July 2020 which was on Friday, for the outstanding amount. Which by now is still not been allocated to my account, My phone is locked. Their customer care line, no one is answering on 081180. So who can help when everyone is on lockdown.