Why can I not renew weekly meds after the last dose

I drink a pill for osteoporosis once week. I have to drink it on a Monday, so cannot collect on on a Monday after I have eaten and pharmacies are closed on Sundays. When I want to renew my script, I am always early, even if I come on the day after my last pill. It seems that Discovery would prefer to pay for broken bones rather than allow me to collect my meds two days earlier than 28 days. I have a life, Discovery, (which is what I thought you encouraged your clients to have) and my life does not involve waiting for my pills. I am so irritated. Anyway, I suppose I will start buying my meds from Clicks online so that I do not have to sukkel.