I've left UKFSN after a year of terrible service (perhaps 90% of emails not replied to, many things breaking, interruptions to service, etc.). This took a while as my request to switch plans was ignored, then my request for a MAC was ignored, and so on.
However, a few months ago my payments to UKFSN's bank account were rejected by their bank. Despite sending several emails pointing this out, and unanswered phone calls, there was no response by UKFSN.
Now I've left, UKFSN are sending me demands for money, threatening legal action. My emails in response have (rather predictably) been ignored!
I'm not keen on paying this cash given the circumstances. What are my options? Do I have any right to arbitration through Entanet or Ofcom (etc.?)