Disgusting service and over billed!

Rain is trying to **** me or probably they have enough customers and just treating loyal customers unfairly. They are over billing me. I recieved 3 confirmation of 3 different billing amounts. I migrated to 19hours then got a confirmation that I'll be paying a pro rata amount of 241 instead of 250 then on 1st on November I got another bill that I'll be paying 250,when trying to pay yesterday it's requestinv 479 Rands while I'm on 19hours which switches off at 6 till 11. I wrote to them 4 times and none of the tickets are being solved instead I'm being asked to send proof of confirmations which I have. No one is replying to me and tickets are all closed without resolving issue. I'm disgusted and shocked by Rain