TO BUY PICK N' PAY AIRTIME ONLINE IS IMPOSSIBLE AND NEEDS TO CHANGE

I GOT A CELL PHONE AT PICK AND PAY ON THE PICK AND PAY CELL NETWORK WHICH IS RAN BY MTN... OWEVER, WHY IS IT THAT I CAN ONLY BUY RECHARGE PHYSICALLY AT THE SHOP ITSELF. WHY CAN'T I BUY ON "ASAP" SERVICE OR ONLINE AT PICK AND PAY ONLINE SHOPPING. THIS IS RIDICULOUS. PICK AND PAY NEEDS TO CHANGE THIS.