Webafrica harassment

I Have no idea why Webafrica wants to charge me for a service that I canceled a month in advance and I returned their router to them an hour's drive away cause that is the only place it can be taken to Nology in Centurian. Don't get me wrong they were a good ISP. I was with them for almost 4 years but it seems like they treat customers badly when they cancel they are trying to force money out of me for stuff I've never used and don't have. I did not ask to be credited when the internet went down for over a week sometimes 2 weeks in the time I was with them I paid my account.