If you happen to buy Safaricom credit by mistake via MPesa, do not be worried. You can easily convert the credit back into MPesa funds by following the below simple procedure.
However, you need to ensure that you keep the exact amount intact. Example, if you accidentally purchase airtime worth Ksh.2000, you need to ensure the exact amount is still available before proceeding with this procedure.
Also, in case you had a pending Okoa Jahazi, kindly also top up the balance to meet the initial amount.
This method should also be done immediately you realize the mistake and should not exceed 48 hours.
To reverse the airtime back to Mpesa, you simply need to forward the MPesa transaction message to 456.