Barclays PLC Credit Card Complaint

Barclays PLC Credit card department,

Other fee Massachusetts

Was a happy - card member for years, in late -/-/2016 - converted the card portfolio to Barclaycard ( - ). We almost never carry a balance over, but we started to in -/-/- and Barclay has been overcharging the interest expense every month. Instead of charging interest on the carried balance they charged it on the entire average balance. So if we charged $3000.00 last month and carried $3000.00 from previous months then they charged us 15 % of the $6000.00 = $75.00, should have been $37.00 in interest charges. They are double dipping, getting the interchange fee ( 1.5 % of purchase, equal to an 18 % apr ), plus they are getting the interest on the purchases at 15 %, that is the equivalent of an 33 % interest charge. I feel this practice is very unethical, if not illegal. We converted, not by our choice, from - to Barclaycard MasterCard, so if we leave we lose all the points we acquired in previous years. Completely unfair and is why the big financials have the hated reputation they have now. Hope you folks over there can investigate.