Frontier Airlines review: at no time did anyone mention of gate change

On November 9th we were at gate 12 at 7:30 waiting to load for Syracuse and at NO time did the three people that were on gate mention to us that the gate had been changed , we printed off our gate info at 6 and nothing of any changes, at 5 to nine i went up and ask the man when are we going to board and he said OH ITS AT GATE 16 which is very close to us at the end of the airport, so i grabbed my wife that has a pacemaker and ran to 16 and the huge man just closed the door and said we cant open after we close it.AT NO TIME WAS THERE ANNOUNCEMENT to the change or even ask for Mr and Mrs Lloyd ..wife was crying uncontrollably , we only had our carry on , i started to panic and having some discomfort in chest ,i had a 3 by pass and a new valve along with a new left hip, The only thing Frontier offered us was a late flight to Detroit and then a carry over the next day to Syracuse, Our flight down was great , but a total Nightmare on return, We sat there from 7:30 and NO MENTION of change , This needs to be fixed, i could see the three employees chatting it up and not doing there job..We got on the next day flight $250 and had to get a motel room at $143 and a extra day of parking at Syracuse , we are plainning our next and possibly our last trip to Orlando to see our friends for they arent well. A travel voucher for our next trip to Orlando would make us happy , This clearly was not our fault ...