TD Bank US Holding Company Credit Card Complaint

TD Bank US Holding Company Credit card department,

Billing disputes New Jersey

I have an account with target I pay my bill on time every month but I have noticed for the past few months when I check my available credit it tells me I have a certain amount then 2 days later it 's gone ex paid - bill on the - went to target spent - on the - I only have $9.00 available credit called them they told me it was interest for - I asked them is n't - interest included in my - payment and he said yes so the why I see it I 'm paying interest twice. I told him if I have $200.00 credit available at - - and I spend - I still have - left until my next billing cycle I have never heard of this type billing before