Contract upgrade or was it a downgrade?

I've been with Autopage cellular for more than 20years. My contract was up for renewal on 3 September 2015. I called the cancellations department in August but was convinced to renew my contract for another 2years. In the past I've had no issues with contract renewals as it has always gone smoothly. This year however i noticed by mid September my bill was already R900. I called customer services only to discover then i was being billed out of contract rates. The consultant said they would investigate the matter. No one got back regarding inquiry. I called again and spoke to a consultant by the name Amanda who found it hilarious that i was inquiring about contract and data usage. For 2 years i have been using between 1 to 1.5gig data. Now that I'm 'out of contract' my data usage have gone to almost 3gig. I would like clarity on my new contract and billing details. Thanks.