Credit Limit Reduced without Warning

Hi,<br> <br> My credit limit on the Virgin Money credit card has been halved without any explanation as to why this was done. I have called the complaints department numerous times (as well as emailed) but have received no explanation for this. The error has been rectified, i.e. my credit limit was reinstalled to its original amount, but please clarify on the below:<br> <br> 1. Why has my limit been halved, even though I make regular payments?<br> <br> 2. Is there any impact on my credit rating because of what happened? I would like to know of any standing record against my name, and would like to have this cleared as a matter of URGENCY if I am found not to be the guilty party. Else, I would expect to receive a decent and detailed explanation.<br> <br> Thanks