Billing

I have been having a problem how the company cannot have a resolution on my queries, the last query was on Monday and their agent could not really help. Amongst other things that I was querying is a contract that I have with them and part of the deal is receiving 500MB on the first of each month which is loaded on my number midnight of the last day of the month. As I'm writing this review my mobile data has been switched off since the evening of the 30th of June which was a night before I was allocated my 500MB and it's already less than what is supposed to be loaded to my number without having connected to my mobile data, and this is something I have suspected for a while on my billing and every time I'll be trying to query it I will not get any answers and that is upsetting.