Gridhost: Worst service i have experienced

Gridhost put the phrase 'Account Suspended' and similar wording on my website. I was not even a client of theirs. I have been battling since last Friday 24th November to get them to remove the wording and to leave my website alone. They did host my domain name, but had nothing whatsoever to do with my website. What has infuriated me as much is that it is virtually impossible to contact them through their call centre. And they take very long time to answer email, and then, amazingly, DO nothing. I have exchanged email with 3 people, none of whom resolved the problem. They admitted it is a 'glitch' on their side.