Thirteen days and counting

My contract with Autopage expired on 12 December and I ported my number to a different mobile network. Yet, I was still billed on 9 January: of the R452.98 invoiced, R428.98 related to the period I wasn't a subscriber any more. Subsequently, I requested (a) that the the invoice was credited and b) that I was reimbursed for the part of the December invoice (billed in advance) that I wasn't a subscriber The request was made on 5 January. On the 14th, only a credit note for the December invoice was issued (but because the January invoice hadn't been credited, I didn't receive any funds. On the 15th I logged another request on the website for the January invoice to be credited, but after 13 days I haven't heard so much as a word from them! I tried calling their contact centre, but they just insist that because there is an online request, it is already in the process. Surely the process can be expedited?!