Barclays PLC Credit Card Complaint

Barclays PLC Credit card department,

Credit line increase/decrease California

The following credit card company has closed my account for some unverifiable reason : Barclaycard For general correspondence : Card Services - - -, DE - Customer service - I have contacted them a few times and they have failed to respond back to me. I have also requested to be communicated via mail because that is one of my rights, they have also failed to communicate via mail and they are still calling me. I 'm requesting a full investigation on this issue because this is damaging my credit.