Rude / ********* practice

I was given a cellphone mount to the value of R250 fpr my birthday, unfortunately it did not fit my cellphone. I went to Cycke Lab N1 city with the receipt to exchange the product for something else. There was nothing with in the allocated budget that met my needs so I asked to rather get the money back. They refused despite the fact that I had the physical proof of purchase. They demand a bank statement from the bank that shows where the money was spent at their shop. My time and effort to get what they want is worth more than the actual money I am.asking for a refund for. I have been researching and and discussing finance options for a R34000 Gravel bike, their attitude and actions regarding the R250 has cost them the potential R34000 sale. They are not the only cycle shop around