Amzn.com/bill Wa — charges to my account that I have not authorized

Website:

AMZN.COM/BILL WA

I have 5 amzn.com/bill wa charges on my credit card that appear every month around the 18th or 19th of the month. The amounts are quite similar in prices, but they do vary. Usually, the amount is about $37.00, but it raises my interest amount by $65, 47, i have no idea what the charges are for. I' appreciate some help to end these charges. I am a retired teacher on a fixed income and these charges are wrecking my credit account. What bothers me is i don't know what the charges are for — services? Products? I can't afford to lose $100 a month plus interest.