NON-EXISTANT CUSTOMER CARE

i've had an account /contract with vodacom for several years, firstly, this was a contract taken out for my daughter that no longer lives with me and since inception, there has been a debit order for this contract, then all of a sudden they no longer deduct the due amount via debit order but send me invoices and demands to pay where has the debit order gone to? i never cancelled it, it was never returned for whatever reason, you are unable to speak to a human being at customer care and i cant use the contract phone for the OTP that is required all the time because the phone is not with me now what to do???????????????????? SO PATHETIC