Billing error for a full year

I got a response from them on a google review but my issue was not resolved furthermore I was kept on hold for the billing department for more than 25 minutes. It's the second day now without connection. Instead I got another bill for the handset that I do not have I've been billed twice for the router and the handset every month for 12 months. My service is interrupted every month for the same error on their system and I'm left without service while they sort the issue on their side for 12 months. I'm not sure if they really expect me to pay for something that I do not have. My husband wants nothing to do with them anymore but I just want the service that I paid for the rest of the month then we'llpart ways.