telkom mobile full of ****

bought 500mb mobile data on the 2nd of march, im unable to use them. when I call customer care they are telling me that I should have bought all networks telkom data and not telkom mobile data, and that there is no coverage where i stay, which is weird because I can make phone call using a telkom number, so how is that possible. what is also suprising is that I have used telkom mobile data before but now I cannot. bring back my money