Incorrect data allocation

I upgraded my data contract on around the 8th of June at the MTN store situated at 3 Simmonds street from the 3 plus 2 package to the 10 GB package. The lady who helped me advised at the time that the new allocation, that is 10GB would become available on the new cycle date which for me is the 21 st monthly. Perfect only MTN did not deliver on the 21 st. Instead I got my old allocation of 5 GB. I have logged my complaint with the store, executive complaints and even on Twitter but I have not had the courtesy of a response. The store told me it would be in by midnight....only it has not happened. Guys it's simple - give me what I am paying for.