VOX customer service is terrible

Vox took two months to install my fiber line, once up and running they neglected to bill me for the first two months and then tried to debit my account for 3 months at one go. Needless to say the line is now "shelved" and my account rep and debt controller from VOX keep saying that it is the others department. Still have not recieved a call from either of them dispite many requests.