Customer service -refund

I purchased an item @ full price at store A , the shirt I bought was too big so I decided to return it at store B , on my side I did not have a receipt of purchase is it was misplaced I do acknowledge that , the tags where fully intact with original price & not discounted as per the manger & the system , I could justify the purchase via my proof of purchase via my statement , the manager then insisted that she cannot override without the original proof of purchase and then side remarked that this shirt was already purchased on discount - which was rude I then asked for this proof which was shown to me in form of an email but still incorrect on the price , I did not want to argue any further so I took the value as a gift card as the store is not on my route and left , this is not acceptable and to judge people when the proof is clear !!!

I want the refund & will nit support this brand any longer with such bad customer service - go look at your facebook posts which you do not even respond to!