*****ulent sale getting me tied into a term contract

I'm on a month-to-month with Telkom Mobile, I do not want to upgrade currently because they cannot offer me the phone I want. Recently I received yet another sales call trying to upgrade me, I explained that I don't want to upgrade unless the specific phones are available, the caller told me that I misunderstood the reason for the call, it's not an upgrade, they just want to charge me less for more data per month. I explained that I don't want to be locked into any term because I want to be able to upgrade as soon as the specific phones are available. The caller told me there is no term, this is not a contract, and it was confirmed more than once that there is no term, they merely want to make a change. Well, I guess I'm the idiot because I'm now locked into a 24 month term contract, it's a SIM only deal. I've called more than once, I've been transferred to more that three other departments on each call, I've been told management is looking into it, but I get no reference and don't get any resolution. This is my last notification to the company, after this I'm going to the ombudsman.