OUTSTANDING CREDIT ON MY ACCOUNT

My contract with Nashua Mobile was taken over by Altech Autopage in November 2014. On this existing contract I was allowed two discounts. On cell phone no. ***, a discount of R50 and on the second cell phone no. ***, a discount of R99. On my December invoice, no discounts were given. Since the 11th of December 2014, I am sending emails (20 in total) and making numerous phone calls to Altech Autopage's head office as well as the branch in George. I was promised that my invoice will be credited accordingly. On my January invoice the discounts for January were correct, but the December's discounts were not credited. Yesterday I received my February invoice where the R50 discount for December was credited, but the R99 discount is still outstanding. It was not at our request that Altech took over our contract from Nashua Mobile. This means that Altech has to abide by the contract we had with Nashua Mobile and assure that invoicing to clients should be 100% correct from the start. Don't put the responsibility on the client to sort out these problems. I shall appreciate it if this issue can now be sorted out once and for all.