Barclays Bank — relentless collection calling

Address: 03054

My bill is typically due around the 21st of each month. This current month, i mailed it via usps that weekend. It probably didn't start moving until monday. Yes it would be late. First collection call on tuesday september 24th and continued every day thru saturday the 28th. These people are relentless. For this bill my minimum was $79.00... (I pay far more than minimum and always try to pay the full balance.).in any event it's overkill.