Credit card — SYNCHRONY FINANCIAL (CA)

Unexpected increase in interest rate. I opened a Care Credit account through my chiropractors office on XX/XX/XXXX. At the time, I was not informed that the account included a deferred interest promotion. No one at the office explained the promotional terms to me, and I was never made aware that interest would be retroactively applied if the balance wasnt paid in full by a certain date. In XX/XX/XXXX, I discovered over {$550.00} in interest had been added to my accountcovering the period from XX/XX/XXXX to XX/XX/XXXX. The following month, an additional {$37.00} in interest was charged. I sent a certified letter to Care Credit in XX/XX/XXXX requesting these interest charges be removed. I also followed up by phone, but was told my request was denied because I had signed the agreement and