Petco liar manager Fountain Hills Arizona

I got a new dog and I did not know what kind of food he would like. The manager turned me on to some different foods. He told me, "don't worry, if you dog will not eat it, you can just bring it back for a full refund"  

So 3 weeks later i returned with one of the 3 bags of food i purchased. 

The manager, a guy with really long hair said, I could not return it. 
The jerkey manager gave no other explination. 

Another customer was there at the same time complaining about dangerious toys they carry that dogs can choke on. The lady lost her dog choking on one of the toys made by Petco. The manager was rude.