Telkom Mobile 5gb Promo Data

so two years ago i started a telkom mobile contract which offered 100minutes 150mb (all networks data) plus an additional 5gb promotional data for the duration of the 24month contract.<br> the package worked out great for me until now. my contract expired in dec and when i was offered to upgarde for a new device i told the lady that this would not be necessary as my device is still running smoothly. it was explained to me that the contract can continue as per usual BUT the promotional 5gb Data will fall away. i understood this and carried on with my life only to then find out that this months debit order would be sky high as the 5gb data has been charged to my account! this is something like an additional R350! i never once requested for this data to be added to my account and apparently this would continue unless i upgrade or cancel my contract, being highly upset i was then forced to cancel my contract with you guys as upgrading is not an option for me right now. i feel that is extremely unfair to be charged for data that i have not requested. all i want is to stay on my contract on a month to month basis untill i am ready to upgrade is this asking to much!?!