Glxboy East Rand Bad Service

Poor service, I bought 2 tshirts, I wanted 1 large and 1 2Xl they put 2 larges in a paper bag. When I got home wanting to change I find that it's the same size, I went back to try and exchange they told me I must check the slip as it's written there, They didn't exchange for me due to that reason, what ****es me offis that no one explained to me otherwise I was going to make sure that I check everything before I leave the store. I had to call headoffice for assistance, that time I'm using my petrol to go up and down to the East Rand Mall and the staff there is very rude from the manager...