Frustrated, Out of options

I lost my job and for some time I was unable to pay the account that I have with MTN, which was then sold to VVM who after some time went cold turkey. Now that I have a job and in a position to pay off what I owe to them I cannot seem to get a hold of MTN to make the payment, I've gone to the branch and I was told my account is with Legal. I've been calling 083135 religiously hoping to get through to legal, I've lost count of how much I have spent on this at this point. I called VVM but they don't have any information regarding my account. I've sent numerous emails to Collections and Legal, still its a dead line. On the off chance that I do manage to get through to Legal, I'm told what my account is a business one and so they are unable to assist me. I mean, what should I do? Why should it be so hard for me to pay what I owe to this company? MTN is meant to be reputable but their customer service is really atrocious, what good is a branch if it can't even make a direct call to a department for me? What good is a customer service line if it does not service my needs? Is it MTN's way of telling me I should keep my money and not pay them as an honest consumer should?