Autopage overcharg customers & capping not allowed

This month I received an account from Autopage for R2200 which is supposed to be R599 for two mini I-pads with 2gig data each. Upon investigation I discovered we went over our allowed data and I phoned their Customer Service Centre (whom in the past never gets back to me if call is logged via e-mail) now 14h23 23Sep'15 who informed me that Autopage charges R2 per mb if we go over the allowed 2gig data. <br> I therefore requested that they cap/block each account at 2 gig, not to go over. He informed me that he can't do it which I couldn't understand as other network providers like MTN, Vodacom and Telkom can cap data accounts. I then asked him whether he CAN'T do it or does Autopage NOT ALLOW capping as part of their money making scheme. His response was \Mam