Hi guys I'm having a problem on my phone I keep getting a message from 9600 and I think it's taking 1birr and I want to stop it so how can I do that, I tried texting "stop" then I get a message from another number 900 saying "Dear customer, you have already Un-Subscribed from MARY JOY ETHIOPIA_9600_MT. Thank you. Ethio telecom.". but it does not change anything I keep getting a message a message from 9600, so can someone help how can I stop it?