Engagement ring interest rate question?

I purchased an engagement ring from Kevin jewelers and they finance through several different banks. One of them is Synchrony bank. The interest rate

I purchased an engagement ring from Kevin jewelers and they finance through several different banks. One of them is Synchrony bank. The interest rate is 29.99% APR. I had a 3,000$ balance from them. I've paid it off for about 6 months now and only done the minimum payment of 100$ a month. They've been taking 70$ of the 100$ I've been paying off. So in 6 months I've only paid off 180$ and paid 420$ in interest. I don't understand what is going on? If i start paying 500$ a month instead will they just take 70% of that and still hardly make a dent in paying it all off? If anyone knows how i can pay this off faster please let me know! Thank you very much!

or:I purchased an engagement ring from Kevin jewelers and they finance through several different banks. One of them is Synchrony bank. The interest rate is 29.99% APR. I had a 3,000$ balance from them. I've paid it off for about 6 months now and only done the minimum payment of 100$ a month. They've been taking 70$ of the 100$ I've been paying off. So in 6 months I've only paid off 180$ and paid 420$ in interest. I don't understand what is going on? If i start paying 500$ a month instead will they just take 70% of that and still hardly make a dent in paying it all off? If anyone knows how i can pay this off faster please let me know! Thank you very much!

or:well normally when you get credit for something like that you end up paying the interest rate most money goes towards the interest then to the balance what is left after you pay the interest is only so much going towards the balance that probably why your not seeing the balance go down

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