The voucher numbers are not clear on my Flex Card In this article If you are seeing at least four digits, and you have the serial number, contact the customer care service by dialing 111. But if you see less than four digits go to a Megastore for assistance. Related articles Why is your credit running out? Manage your postpaid account What is the airtime for a recharge? How to reset Mon Cash account PIN ? How can I check transactions that I have paid for?