Refund on product

Bought a stanley flip straw on the 30th of November the stanley was defective they send it back but when they called me to come get my new item it was the wrong product. I then asked for a refund so I could buy the product I wanted somewhere else. They do not want to refund me I have been waiting more than 6 weeks for my item know i have to wait again. Buying such a expensive item one would think they would be more helpfull.