Frustrated customer given empty promises

I was promised when upgrading last year as part of my upgrade in the Cresta store that I would receive 1GB of data for the duration of my 24 month contract.When my airtime was rapidly depleting every month I realised that Vodacom was not allocating my promotional data.After numerous calls to the call centre & back and forth trip to Cresta Store i found out that my contract stated I was getting 1Gb for 3 months & 250 MB thereafter.Vodacom finally allocated 250MG last month & promised it would continue every month for the next 24 months.Finally they allocated 250MB for September.I had 178 MG left over on the 30 September which was to expire on 01/11/2015.I received my monthly allocation today & when I checked my balance it showed I have 0MB of data.I called the call centre to find out AGAIN why the 250MB monthly data was not given to me as well as why my 178 MB were still not allocated to me. After numerous more calls and service requests logged this still has not been resolved. I am so tired of them submitting a service request & still having the same problem. I have been a customer for 11 years & have lost faith in Vodacom. I, the customer is losing money!receive empty promises