Incorrect data received for the last 7 months

Took out a contract in March with 2 Gigs p/m. Since then we have only been receiving 1 Gig p/m. We have contacted the store, no help.

Contacted head office, they acknowledge the mistake and passed it back onto the store to correct. Store manager promised to call back many times, but never did. The store manager told me that he had to get head office to fix the contract, but they have not been responding to him. I have sent email after email to Cell C and the store with no response. I have pictures of the contract deal, emails from Cell C staff acknowledging that we should be getting 2 Gigs, several reference numbers and a complete lack on intent from anyone at Cell C to fix this issue.

How can Cell C continue to do business when they treat customers this way and cannot follow the basic legislation regarding the Consumer Protection Act and deliver on a contractual obligation?