MTN Allocation of payment still not done after 3 weeks

I have been waiting from the 11th of June for MTN to allocate a payment for me. My account is showing overdue after a payment was made on the 5th June. I have made numerous calls to MTN as well as been in-store more than 5 times. I baffles me that MTN cannot allocate a payment made 3 weeks ago. I have sent proof of payment at least 10 times. I have taken the proof of payment into the store and the consultant even emailed the statement to the correct division. I feel like i am going around in circles as nobody seems to want to take responsibility to get this done. I was supposed to be able to do an upgrade but this has been blocked. I have even received a message telling me on that the issue has been resolved. Guess what?? I just checked and still nothing is done. PLEASE ALLOCATE MY PAYMENT!!! as I cannot upgrade and I am travelling internationally tomorrow. I am beyond shocked at the level of indifference shown to me by MTN