You will be unable to top-up if the account has a debit balance (money owing). Please check your wallet balance on the STss Wallet App. If there is a debit balance (amount due) please pay this amount so that you can top-up again.
You can only generate tokens if the wallet has a credit balance. Please make payment into the wallet then generate a token for free on the STss Wallet App.
You are welcome to query the debit balance with the STss Call Centre if it exceeds R5000.