Synchrony Financial Credit Card Complaint

Synchrony Financial Credit card department,

APR or interest rate Nebraska

I applied for my carecredit card at a dental office, not knowing about promotional purchases and the deferred interest because nobody explained it to me, they checked my score and said i was approved, which i got - different procedures done. Ive never been late, i pay the payments and then i get an email that i have promotional purchases that are about to expire, which they did and it affected my credit report and the interest tacked on is higher than the minimum payment, even when i pay more, it does nothing. I was misinformed about the care card