*****-Debiting account for a service I didnt even apply for

Last year August I cancelled one of my fiber lines. After numerous emails this product was officially removed as a product on my client zone. Over December I saw my bank account being debited with an amount from Afrihost. After checking my client zone I saw Afrihost has just decided to activate the product that I have cancelled in August and charge me for installation fees, activation fees (which actually never happened) and charge me for the month for December. How can Afrihost just decide to activate a product which has been cancelled and debit my account for a service I didnt apply for or know of!!!!! Their customer service is extremely poor as no agents are helping me with this query or can explain how they just decided to activate a product on my behalf. I want answers and my money paid back by the end of business day.