Hi twenty1ne - I closed my first account in February after the visit - I received payment in April. For the second one I closed in March and received payment end of May. They did try to tell me I have to wait 6-9 months but this wasn't something I entertained and directed them back to the contractual agreement. As advised it's best to copy in the police and any other authority as it seems this is the only way they'll pay attention to your emails.
PS: Anything they wish to discuss with you, tell them to put it on email. That way you have a trail that can be used as legal evidence.