Not Happy With Time Frame

I currently have 2 service request numbers that have not been resolved since February regarding data usage S3-8XV3O-O0LUU / S3-8XN37-788MM, the number in question is: ***, no one in Vodacom can tell me how I received such high data usage on the number mentioned above, I take it I haven't used any of the mentioned data usage on my invoices, I need a answer as to what's happening with my reference numbers, or I will take it further, you guys are ridiculous with your bill, please assist me. My number is: ***