Poor customer services

Am so angry with how they treat customers at Vangate mall Relay Jean. I bought a pants there for my husband when I get home the pants was small so I return it asking for a exchange I misplace the receipts but everything was still in good place like the price tag and everything I went there to ask for a bigger size. They refuse to exchanged it for because I didn't bring the receipts. I went back home I found the receipts I took the pants back asking for my money back they said I must come back following day they don't have money at the moment. I ask them if their police require them to do that if they don't have cash I am so angry right now. I didn't expect this kind of treatment