********** Upgrade:Monthly subs not being refunded

********** upgrade done on one of my contracts - original sim/data contract R99pm for 1GB - upgraded end Jan 2015 to uChoose SmartM R329pm package - Plus R500pm iPhone 128GB handset. I did not authorise upgrade nor asked for it. I have been billed since Feb 2015 R829pm instead of R99pm. Thus Vodacom owes me R2487 till end April 2015. Firstly Vodacom asked me to do an affidavit to prove I did not do the upgrade, then they claimed they did not receive my fax affidavit, refaced on 21 April 2015. No communication to me. I always have to phone and waddle through the call centers to get to speak to someone who can actually dig into my account / complaints and give me some answer. Go sms 05 May 2015 that credit was done for R1315.80 excl VAT and for R9210.52 (excl VAT). I have been trying to daily to call 082111 or *** to see why was I not credited for the R2487 less R99 x 3. No one can tell me. Eventually spoke to a very helpful AJ in the call center. He sent me the invoices that are due 31 May 2015. Surprise surprise..... the only credit was for the R500 pm portion of the upgrade for the handset (R1500) - the monthly subscription was not credited and I still owe Vodacom money.