Barclays PLC Credit Card Complaint

Barclays PLC Credit card department,

Overlimit fee Indiana

I transferred a $10000.00 ( estimated ) balance to a zero interest card Barclaycard us & I get my first statement, I have $300.00 in interest fees! I call the credit card company, she tells me they will do an " investigation '' and get back with me ... .been 4 months & I have heard nothing!!!! I go on the website to change my due date to a different date, when I have more money in the month ( due to the extremely high payment ). I go on the website 2 weeks late & the date is still not changed. You call the number to the company & " their systems are down, please call back at a different time ''. This company is a sad excuse for a business!!!!!!! Terrible customer service!!!!!!!!!!!