Boost Mobile Lied about unlocking phones Nationwide

We were customers of boost Mobile for approximately 2 years. We purchased 2 phones outright at time of activation and then we purchased an additional phone and had the number switched over from one of the phones and deactivated the first one so the phones were paid in full and belong to us. When we tried to switch service to T-Mobile, Boost told us that we had to own the second phone for a year before they can unlock it so we could not use those phones for T-Mobile service. The one year was up in October 2017. Today we decided we were going to give that phone that we owned for over a year as per what we were told to our niece. We went down to Boost to have the phone unlocked in order to give it to her and now they told us that the phone had to be active for a year. That is not what they told us on the phone when we're at T-Mobile. They only told us we had to own the phone for a year to be unlocked. Now we have phones that belong to us and cost is over $1100 and they will not unlock them. They told us know and we had to remain customers of theirs in order for the phones to be used. We are out $1100 and either want our money back or our phones unlocked! They're trying to hold us hostage as customers. We do not want their service but do want the phones that we paid for and own