Billing error going on for 5 months???? Pathetic

Since march, every month they debit more than they should. This is month 5 now and i had it, this is ******* to take money that dont belong to you. Want want all overpaid monies paid back to me immediately before i take this matter further. The service is pathetic as every minth i phone and promised call backs from billing or price lock and yet i am waiting. 5 months is madness. Where is this TFC compliant? When i check on whatsapp self service on billing it tells me my service is disconnected but if i want to clear an error code it will ask me on which decoder and will provide both sim numbers... Now how *****ed up is that? This is my 2nd complaint on here... I dont know when will this ever be resolved as your customer service is pathetic and cant resolve anything. I would expect someone to call me who are capable of resolving my issues immediately. Who is reimbursing me for all the suffering?