Discovery MedExpress Ordering Issue

Good day,

Each month for the past 12 months i have been ordering from MedExpress (Discovery) with no hassles. This month when i wanted to order again, it keeps giving me the same error: "Your medicine is not due for a refill" but my medication is finished and every month i order the same day last day of the month. I have lodged a query on your facebook page with feedback they will get someone to contact me with no call as yet. Please assist.