I had a very bad experience with the network provider

I had a very bad experience with the network provider. Reason being is I lost my job last year October so I couldn't pay for the wifi. I thought it was a month to month but then they switched off the wifi end off October but everyone month sins they are billing me and with no wifi connection. When I try other providers the keep on saying I owe Supersonic close to R2000 also I haven't signed any contact with them so why would they keep on billing me for something that I am not using. Pls Peter help because they refused to open up the line because they demanding a payment off close to R2000 can you help pls... Regards Gradwell Martin. I am working frm home struggling to get connected and also want to know why they keep on billing me for wifi the is off for the last 10months