Refusal of Pre-packed Chronic Medication

I use Discovery services to deliver my chronic medication, using MedXpress. There is also an option to pre-pack the medication so you can just fetch it at the nearest Clicks. I was off the day so I thought I might as well just ask for it to be pre-packed so that I can go fetch it. I got an SMS indicating my medication was ready for collection, but the pharmacist at Clicks refused to give me my medication, worst part is it is a chronic medication and it is important to be taken every day.

If it was expired or something I would have understood, but the fact is it was already pre-packed I was just supposed to receive it. This is a violation of my rights and now it is a process of call-centers I have to phone and I don't have medication left.