RAIN continues to ***** my money long after I cancelled service.

i cancelled Rain because the service was not as advertised, the connection was slow and the service was bad. I cancelled in September already but they keep charging me for a service i no longer use. i am now paying for two ISPs as Rain keeps *****ING MY MONEY! im at my wits end now as i have continuously written to them. their customer service is atrocious because they do not have a telephone line to call. i have had such as bad experience with them.