Citibank Credit Card Complaint

Citibank Credit card department,

APR or interest rate Florida

I purchased a riding lawn mower from Home Depot using the Home Depot Credit card with no interest if paid in full within 24 months. The lawn mower was defective and caught fire. The company reimbursed Home Depot the full amount, Home Deport credited the account $1800.00 on -/-/2015. However Citibank who is the card issuer did not apply the amount to the no interest purchase and have now added the full interest amount to my credit card.