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To stop promotion messages from Safaricom dial 456#, select stop, then Marketing Messages and then Stop All promo messages. You can as well choose to select which specific promo messages you want to block to avoid missing important promotional messages.
To block safaricom simcard that has been stolen, dial 456 and then select option 3 for line queries and 2 to replace your stolen line. Once you replace a stolen line, it will be inactive.
To reverse safaricom airtime sent to the wrong number then forward the Mpesa message to 456. If bought the airtime through bank or sent through Sambaza, then there is no way you can reverse the airtime unless you liaise with the recipient.
There is no way you can disable safaricom reverse calls. The only option you have is to reject the call if you pick it and realize that it is a reverse call.
If you have paid a bribe using Mpesa and you want to reverse then you will have to follow the normal procedure of reversing money sent via Mpesa. If the money was sent within 24 hours then send the transaction message to 456. If it is more than 24 hours then call Safaricom by dialing 100.