Bad service received from FNB connect

I had a bad experience with FNB connect last week I received a phone from FNB but unfortunately I did not know that if you insert another sim card other than FNB will lock the phone so when I put back the FNB sim card requires a pin or password to open so I called ********** 147 several times trying to get help to unlock the phone, firstly to get through to that number it takes 20 to 30 minutes and when I finally spoke to a consultant I was transferred from one department to another without help I think I'm being through to all department but no one could help still so the last person I spoke to gave me the email address to use and told me they will call me after receiving the email and I did twice send an email till now no one responds now I am sitting with the phone I cannot use and they expecting a payment as it is on contract over 24 months. I'm sending this to Hello Peter to get a help or at least I will personally take it back to FNB branch and request my money back.