Lack of Transparency/ Bad Attitude

In December 2016, I handle a repeat prescription for Nexium, a medicine for stomach ache. The prescription cleared stated that the same should be repeated 6 times. When I went to Clicks today to get my third box since December, the same was refused on the grounds that the prescription should have been used in six months, instead of six times and had expired. I argued this, on the basis that it was supp**** to me before based on the number of times I had collected the medicine, and not in how many months. I also enquired, the reason why I was not informed of this ruling when I got the first box, I could of chosen to get more at once, or alternatively get the medicine in the prescribed six months. The attitude from the pharmacists was arrogant. The customer service of this Clicks is appalling.