Been a client for three days & I already want out

I was phoned by Telkom two days ago offering me a data package. The lady said she would firstly check if my area has coverage (I live far out of the city) which she did, but never told me the results. I agreed to the deal, and she said I would receive an email shortly with all the details. I received no email. I checked online what the coverage is like in my area only to find it is non-existent. I want to cancel my contract before I get trapped with a data package I CANNOT USE. I've attempted to contact Telkom Mobile about this