Pathetic Billings Account No help at all

We have received 50/50 fibre from the first month of payment we have received a bill for two fibre accounts a 50/50 and 50/25 We have phoned accounts more then 150 times send emails over 50 and no one is assisting. We keep on getting wrongly billed over R4000 This is unacceptable everything they just say we will sort it in 3 days this is now since December 2020 Loosing all hope with them and I will not pay a bill that I don't even use or have PATHETIC