Barclays Bank of Delaware - Free Spirit Platinum Mastercard Review

We have had this credit card for over 5 years with a sizable credit limit.  Today we received an email from the Credit Card Company-Barclays Bank of Delaware...US Airways Dividend...they lowered our credit limit due to us paying off our monthly charges when the statement was due. No one in customer service could tell us why we were cut from the high limit to down to $1500.00.  The one associate told us we never charged over $2,000.00 in a month.  So why did they cut us down to a credit limit of just $1500.00 when we spend about $2,000.00 per month.  We pay our credit card every month in full. With this credit card we pay all of our bills, such as electric, gas, phone, cell and extra.  We pay on line.  So what is the deal here.  Do they not want out business?  Do they not want someone who pays their bills every month, on time and paid the full balance off?  What is up with this credit card company.  We never received a notice in the mail when they raised our limit without our permission but now we received an email stating we have been lowered to $1500.00 for lack of use of the card at the higher credit limit.  We would of been totally ashamed if we used the card to buy a big purchase and was rejected due to lack of credit.  We talked to the manager of the credit card department, there is nothing they can do.  Do not use this card.