Debit without service

An agent came to our house and I requested a call back since they are working with Evotel and they had a special that month. I spoke to the agent after a week or so and I told her that we might be moving as we have promise of a new job. She said she will keep everything on hold and make a note of what I said. A month later she called and I told her that we moved indeed so we won't need fibre anymore, that was end of February. End of march they debited my account, unfortunately they didn't get any money but they left my account in arrears. I immediately called Evotel,they gave me mweb contacts. I called no answer, I sent an email, no reply. Few days later they sent an email to say service has been cancelled, but I am liable for early cancellation. Today again they tried debiting my account. They have never provided any service to me, what am I being charged for? Mweb just want to debit and make themselves a quick buck. Pathetic service provider.