Dischem Pharmacist refuses to fill valid prescription- no problem at Clicks

I went to Dischem in Claremont today. I had a 6-prescription for my chronic medication. I keep a copy of my script as Dischem always loses the original. I thought that the prescription was dated end of June 2022, the pharmacist indicated that the script was dated end of April 2022 and that the script was no longer valid. He told me that I should go back to my doctor and get a new script even though even if the script was dated end of April it is still valid for this month (September), he was quite condescending about how I should be managing my chronic condition. It was quite embarrassing as there was a queue at the Pharmacy I went to the Clicks store in the same center and my script was filled in without a problem. I thought that service at Dischem was unacceptable and went back to let the Dischem Pharmacist in charge what had happened. When I spoke to the pharmacist and told him what had happened, he asked to make a copy of the script, but did not apologise for the bad treatment nor the refusal to fill the prescription. This was horrible treatment, I will think twice about filling my prescription at Dischem in future!