Overcharging on data never received

I upgraded in Jan 2015, i also added R99 worth of data per month onto my contract. My data has been running out every single month and sucking the life out of all my airtime... Ive requested investigations into this both instore, call centre and online. Got my ref and never heard back from anyone ... In store they switched off background data - but still the problem persists. I received an sms last month after much chasing to say they will credit me R200!!***? Logged another complaint instore requesting how the hell they got that number when clearly more is due... an apology for one would also go far considering they reduced my data without my consent and continued to charge me full price AND never bothered to respond to any of my requests... 2 weeks ago i requested instore for them to contact whoever they need to and send me my original contract with Autopage, as well as a detailed statement reflecting all data and airtime loaded since Jan... Im still waiting... The instore guy is trying but cant get a response either. If not received today - i will consider it null and void as they obviously dont have it on file - put a stop order on payments and go elsewhere first thing Monday.