Disgusting customer service

I recently moved house and requested a service setup at my new address in November for myself and my tenant, after the request was logged they installed only one line which was at the main house and ended up charging us for both. After numerous calls and whatsapps, we managed to get the 2nd line installed however, instead of them billing 2 accounts 1 to my account and the 2nd to my tenant, they ended up charging me for both lines and my tenant for the other. We spoke to a sales agent and manager on the 2nd of December who assured us that the line under my name would be removed and changed to my tenant which means we would only have 2 lines for 2 households installed and billed. I've spoken to many agents and their service is absolutely disgusting, the way they speak to customers, the ****y attitudes and they lack of empathy. As an FNB/first rand employee, I would be discouraging my company from dealing with this company moving forward.