Poor speed and no response to requests

I have sent three mails to Rain to have my subscription cancelled without receiving a response. My first mail was at the beginning of October where I complained about their 2Mb/s speed and asked for the cancellation of their service. It is now almost a full month without a response as to whether my subscription has been cancelled or not. Their moto of "let's investigate and get back to you" obviously does not exist. There is also no other way of contacting them other than e-mail. I have now been charged for October without the use of their service. If I had the option of giving them no stars I would.