Paying Credit Cards By Spending on Them

I lost my job a couple months ago and had no savings. So making my credit card minimums the last two months had been tough - meaning I can't pay it. It just occurred to me to buy stuff at these stores and then return them as my payment. It does show up as a credit on your statement when you make a return, so we'll see if this works. I've spent a couple hundred dollars this week in this effort, so if this doesn't work I'll be farther in the hole. Crossing my fingers.