Phone cut off 5 times, 5 phone calls to call centre, 5 emails with proof of payment. NOTHING

What company does not allow you to speak to their accounts department; or email a manager! over the last 8 weeks, my phones have been cut off 5 times. A payment made has not been allocated and is causing havoc with my account. I have phoned the call centre 5 times, have emailed the proof of payment 5 times. Each call centre agent has emailed the payment to the INFAMOUS COLLECTIONS DEPARTMENT, but nothing gets resolved. I visited the Blue Route Mall BRanch on Friday where the manager very kindly escalated this matter as well; and they still cut my phone off today; team manager unsympathetic, no escalation