Barclays PLC Credit Card Complaint

Barclays PLC Credit card department,

Balance transfer Virginia

I was offered several 0 % interest rate balance transfers with different expiration dates for each one. I have made monthly payments and when the first transfer was about to expire I paid it off. When the second transfer was about to expire I asked what the balance of the transfer would be. I was told a different amount than what I calculated. I was informed that they could not keep track of where my payments went and the company could apply the payments to any of the balance transfers. My issue is that the company is not honoring the expiration date on each of the transfers and is now charging me interest.