Vodacom

So once again Vodacom is forcing me to use there network I got a device which is network locked and at the back it says Vodacom SIM must be in the device for it to work so it's in aswell as my Telkom and I was using the Telkom data for about 7 days when I get a message saying they detecting a different network so it switch my Telkom off and I'm only able to make calls no sms or data usage ,I then call Vodacom as I check the box and it tells me that they will provide me with a unlock code which is not true obviously hence why we here now ,they tell me to go to a Vodacom store and I do that and they tell me some story that they only give the code after 12 months I had to change everything to this Vodacom number my banking aswell ,and I'm now purchasing data every 7 days and that's just WhatsApp so Vodacom Is forcing me to be a part of their world this is not on this should be my decision