Contact them again and tell them that you cannot get a deadlock letter from a company that is not communicating with you. Ask them for help to resolve this since Fast4 failure to respond to contact should be taken as a dealock in communication, again report to trading standards and OFCOM
CISAS said that Fast4 aren't obliged to send a Deadlock letter. They said I'd have to wait 12 weeks before I could lodge a complaint. So I asked them what if Fast4 took it to county court in the mean time and they said that if it goes into the court sytem then there was nothing CISAS could do because it was out of their hands. I then asked what was the point in CISAS in this sort of case and they said that said 'I don't know'. Maybe I got a bad operator or something but they kept saying that they weren't an advisory body so I suppose I can't really expect advise from them.
Already complained to TS. Not done OFCOM yet, I'm busy writing the letter that I'm going to copy to Fast4, the debt collectors and OFCOM.