Credit due

Hi There <br> <br> Last December15 I called to cancel my contract and I was offered 3 months credit should I opt for an upgrade. Instructions were simple, once upgrade done I should call 808 in order for the credit to be app****<br> <br> Upgrade was finalized on the 8th of Mar 16 and now I am given the run-around. I called MTN to check how to go about this and I was told to call back on the 21st March after the billing is done. I did just that and was told since it's a public holiday the invoice is still not closed and to call back the next day, 22nd Mar. Today I call only to be told the retentions department is the one that needs to apply the credit and it will take 7 working days for feedback to be received but by then MTN would have debited my account on the 25th. <br> <br> I would appreciate it if the retentions department would look into this matter as I have run out of 7 working days <br> <br> Thanks <br> <br>