ADSL Contract

I'm trying to cancel a contract that I have signed up to. I phoned the call centre the very next day, kept waiting for around 30 minutes before call centre agent took my call. Then he transferred me to the Retention Department, kept waiting for 45 minutes and I eventually hanged up. Sent them call requests, emails, still phoning them without any response. Really, I haven't even got the product yet, and already you are providing the worst service ever - just like all the complaints on this website. Should have checked this site first before I considered signing up.... So please can someone make contact so that we can resolve this??