Pathetic service at Clicks Pharmacy

My Medical aid (Medshield) forces me to make use of Clicks to get my chronic as well as general medication. However, their service is PATHETIC!!! Every year round December/January they simply cannot supply my medication. How bad is that? Surely they should know they must order this early, as it is a regular item for me. They always blame the supplier. They also add items I specifically said they should NOT repeat. They add it on my medical aid and then say they cant reverse it. But it is THEIR fault. I wish I could just get my medication from Dischem, as their service was way better.