Second Sim on Dual Sim handset locked by Vodacom although device is capable

After 16 years on prepaid with Vodacom on the same number, I took out a contract in anticipation of a dual sim handset - Hauwei P Smart. The consultant inspected the sample phone with me to confirm that a 2nd simcard slot was available as this was a key decider on taking out the contract. When I got home and tested out the second sim, I find out that it is not working. I called Hauwei who informed that the phone has dual sim capability but Vodacom locks that function and that I should speak to them. I called Vodacom however the consultant puts me through to a contracts upgrades department rather than somebody who can assist in unlocking the second sim slot. I can't understand why Vodacom would lock this capability on the phone. I wish to have the device unlocked for the second sim or the contract cancelled if they refuse to unlock it without incurring heavy penalties for their roggish/misleading handsets. Vodacom, you are going to loses alot of valuable customers to you competitors if you can not come to the party on this dual sim handset concern.