Unfair Overcharge on account

Very unhappy with my Telkom bill and their service. I took out a contract with them and was promised I would get an extra 10 gig data for the first 3 months over and above my 1 gig , I got the phone 18 Feb and received 480 meg data only. unaware of the lack of promised data we went ahead and set up the phone, come beginning march I get a bill for over R500, r249 for the agreed contract the rest for overusage of data. Now explain to me how I must pay for data if I never received the promised extra 10 gig data? which is the only reason we overused data in the 1st place.

I have logged numerous complaints and received case numbers, 5 march ********** I logged a case for the 10 gig and for the over charge of data (only the 10 gig was logged) ********** 1 another case for over charge of data, escalated cases on 14 march, 15 march a new escalated case number ********** 3.

I have since received the 10 Gig data but the account has still not been rectified and I have not been contacted at all. If my account gets debited with anything other than R249 as per my contract I will be reversing the payment. I expect answers on this and my account to be rectified before the account due date.