Free data promised for 3 months on taking contract

I did an upgraderenewal on my cell c contract in December 2015, effective in Feb 2016. I did it over the phone and was told that if I did the upgrade at that time I would get a certain amount of free data for 3 months becasue of a promotion. However when the new contract kicked in there was no free data as promised. I logged a call in this regard with Cell C on ***, case reference no: *** .I have made follow up calls since and I haven't had a single sms or call with regards to feedback on this from Cell C. They requesting a copy of the recording but surely it doesn't take this long. Let alone there is no communication to let the customer know what is happening. Service is pathetic, too quick to assist when taking a contract but no service when there is a query.