Misleading Sales Agents!

I had a contract with cellphone contact with Vodacom, which ended in May this year and one of your agents called me to offer me a new cellphone contract which I declined as at the time, I didn't want a new phone. He then offered me a Flex 65 plan for which I will get R65 airtime every month which like an R10 discount which I accepted but was told that I would be able to a device on this contract when I wanted to upgrade. Today I called Vodacom sales and now I am told that I can't add a device on my plan and will need to apply for a new line. Which means that I get another cellphone number that I don't need. Had I been told that if I accept this offer I will have to wait 22 months upgrade, I would have not accepted this offer because I knew I will eventually want a new phone, now I am forced to pay for two plans when I only want one get a another cellphone number which I don't need! Your agents willing mislead us so that they can get sales commissions!!!