Bad customer service and late service delivery

I would like to share the worst experience ever with the service provider I have a contract with them, but something odd happened when I got billed double what I pay, and I honestly thought it was a mistake, but it wasn't, I enquired as to why I'm getting billed twice the amount of my contract and I was told that a fibre line was added to my contract, I didn't do that, meaning they added a line without confirming with me(the account holder) that is *****!!. I spoke to them and I was told it would take 14days to resolve, this was in September we now in November, two months I'm getting billed for something I don't know. I would like to say that their customer service is a joke and I'm not happy with them at all, maybe writing this review will make them help me.