Credit card limit decreased without my knowledge

exactly a week ago.. without my consent my credit card limit was decreased to an amount that was under the credit I already have used. Therefore putting me in debt. Credit card charges were charged for being over my limit which i am mow accountable for. When calling and trying to find out the reason for this ( after the phone being put down on me more than once) no one can give me a straight answer to why this has happened.<br> <br> when i managed to get off work to go into the bank to find out what is going on with my account the banker is unable to help me and i get told to wait 48 for someone to contact me to reverse the above charges.<br> <br> Returning to the bank 48 hours later today... I still have no answer and my account still has not been rectified. Just to only be told this has happened to many people over the past week.<br> <br> At the same time im extremely concerned to what further charges i will receive for my account being over its credit limit!<br> <br> Furthermore there is no one you can contact directly to find out what is actually going to give me a descent answer or rectify the problem