Thumbs down to Edgars

I have lost the considerable sympathy I had for Edgars. Their accounts seem to be in a mess and it is impossible to get hold of anybody to assist. I have emailed the address that they give out on all their correspondence : edg******* . I received an automated reply promising a response within 48 hours and nothing further. Furthermore my email shows as unread! I had previously phoned and spoken to a very pleasant consultant but it did not seem to make any difference. She did say that Edgars was aware of incorrect charges due to a "technical glitch". I have tried to phone again and held on for about 20 minutes without a response. I want to close the account - can anyone tell me how? Due to errors on the account I don't know what the correct outstanding balance is.