No SMS to Ireland

I entered into a contract for a cell phone with Telkom Mobile an April 2014. I expressly asked if I could send SMSes to Ireland to my family there because Vodafone allowed me to under my pay-as-you-go scheme. The salesperson rep**** that this was indeed possible. When I could not get through via SMS, I complained to Telkom Mobile. Finally I was contacted, tests were run in real time on the SMS. It did not go through. As I entered into this contract for this express purpose, I believe that they breached the contract by failing to report to me about the result of the test they did. In fact they refuse to reply to my email messages. This is frustrating and I want my contract cancelled . I have been very patient with Telkom Mobile who sell you contracts that are not fit for purpose.