CHEATED ME OUT OF 100MB AND WONT CREDIT ITBACK - ***

I am extremely disappointed. I recharged yesterday on ***. I had 128mb data. I received 250mb bonus for 1 hour. I downloaded 1 show on Netflix. 1 minute shy if an hour, I still had 260mb left. Literally 2 minutes later I check my balance and I only had 30.4 mb left. I called cell c. I asked why was my data used instead of the bonus I was given. The lady told me that they have been having issues with the bonuses for a while and their it department is working on it, but unfortunately she cannot credit me data as the hour has passed. She said that some times the bonus does not get credited and you have to reboot to ensure that it is in. I explained to her that clearly this was not the case with me as I checked my balance before downloading and at the expiry of the hour I still had 269mb left. She apologised and said next time I must reboot anyways as this is a recurring challenge with bonus data. But she said her manager said she cannot credit me my data. I lost almost 100mb because of their system malfunction and I think it is disgusting that they won't credit me what is due to me