Synchrony Financial Credit Card Complaint

Synchrony Financial Credit card department,

APR or interest rate California

I was approved for a - - Credit Card for - limit. I bought a bed for around - and was told they was no interest on the card. Each month I receive an email informing us to pay the minimum balance of $25.00. Each month I pay $100.00 to get the debt down quickly. My balance went down to about $200.00 and in -/-/- I receive an interest charge of almost $400.00 at 29.9 %. I am shocked as I have never seen this in any of the emails notifying me payment was due. I want to pay my original balance in full immediately and have the interest charges dropped.