Terrible service and customer service

A terrible service provider - struggled with fiber when installed with periods of no service. Even worse is the cancellation process. I cancelled my account with them in January, which they tried to ignore for months. Only for them to send me notices of demand for a month payment in August. Despite numerous attempts to inform them that they have no right to payment, their customer service never once responded (on email or WhatsApp) I then tried to call them - they leave you on hold for at least 5 minutes, and then proceed not to resolve anything. Their service is terrible. I am deeply unhappy with the whole process of dealing with them.