Disappointed customer

I've bought a device from my Bank on Black Friday and received a sim card with data that can be used for 6 months. When I've inserted it into my phone, it gave me so much problems. My phone was literally blocked!!! I had to go to vodacom to clear my phone back to factory settings. When I've queried it with the bank, they've asked me to put the sim into a phone that only uses 1 sim card, nothing of that sort happened. I was then advised to take it up with you (Vodacom). Why do you sell phones to us that can ONLY take Vodacom sim cards? We don't buy phones to experience such a problems and why don't you tell us that in advance, so that we can decide if we do want to buy or take out contracts with you. I had to go back to the bank to do a lot of changes on my accounts and also had to pay cleaning my phone!!! This is so bad