Dis-Chem poor service

POOR Service from Dis-scem(on the department of chronic medication) I have started to use Dis-chem this year in march when my Doctor sent my 6 months prescription to them.

They did sent me the first medication in April, there was nothing wrong with it .when they sent the second and the third one,the have sent me the wrong medication.when i phoned and asked, they have said because they don't have that kind of medication (out of stock)my Doctor told them is fine they can give the ones they do have, when i phoned my Doctor he was so suprised to hear their lies.

They have said they going to take back the 2wrong medication but, replace them with Only one medication?. When i ask why, they told me it is how it suppose to be. Another thing is they said, they are not going to able to give me all 6moths medication , because my prescription is going to expire. so for this, my Question is, this script have been in their hands from end of February, but they are not going to be able give all 6months medication?.