Chronic payment change without notifications

I was never informed by Disovery Health that chronic medicine now have to be ordered from Medxpress unless you want to incur a substantial penalty. When I went to collect the medication as usual from the pharmacy there was a R700 payment I had to make. I called Discovery to query this and was informed that I had been informed in March of the change and that the claim could not be reprocessed. I have not received any such communication from Discovery. Discovery has my postal address, email address and telephone number - but failed to notify me on any of these mediums - and I am out of pocket for in excess of R700