Contract not signed up for

On the 29th of February i received an sms that i have signed up for Uchoose flexi 55 which i have never did. And the next minute i received R55.00 airtime, and the following day another R55.00. Tell me what is going on as i have never spoken to anybody from this company. I enquired the whole day from Vodacom and they gave me RMCS details.<br> Please cancel this contract as i have never consented let alone spoken to anybody regarding it. This is bad service at it's best as anybody can do what he wants with our details as they have access to it.