payment not reflexting

I had recently upgraded in June on the 06th to my knowledge my contract was expiring in July and i was told that i can upgrade a month before the contract expiry but i was never told that i will be paying for the previous phone and the new phone so somehow I was supposed to pay double on which unfortunately it came back as unpaid i than went to the store in carnival mall to find out why they attempted to debit so much i was than explianed what had happen i was still left to pay the previous phone and the new phone i than made arrangements on paying the arreas amount of which R100 was added for bouncing off the debited order which which than also made my debit order to bounce again than than made cash payment to a standard bank account which is *** and they said my cellphone number i should use as a ref number payment reflected immediatley i than changed my method of payment from debit to cash as i saw that i would mess up my credit record so now on the 20th of september i made payments of R1000 till this day it is not reflecting i call the call centre every day and have sent proof of payment but im not getting any assistance i would like to know what is it that i should do?