Incorrect Billing bad service

MTN has billed me incorrect and just deducted the money off my account. I reported the error. they have not been able to give me any invoices for over 10 days. finally when I received an invoice the invoice is for an incorrect number on my account. This is still not sorted out as the matter is escalated and me as customer sits with money deducted incorrectly. The call center just says sorry we working from home. The branches at shopping centers says they can not see any invoices on the system. so sorry.