Cannot get hold of the legal department of MTN

My account was in arrears, which I have now settled. But, my account has been handed over to the legal department. I have tried to get hold of the legal department many times but to no avail. I am now due for an upgrade on my cellular phone, but I can't seem to go through with it as I would first need to get in contact with the legal department that is handling my account. I request for the legal department to get a hold of me, or give me any details in which I can get a hold of them.