Owners/service Manual problems of the 2015 Ford Fiesta

My transmission has been having problems since the day I drove my vehicle off the lot. I made several attempts to bring it back within warranty; however, I was told nothing was wrong and departed home. Since then, I brought it back about 2 more times & was told again and again, the transmission fell �within working capabilities�. Not long after, I received a recall in the mail regarding the transmission. When I brought the car back again and showed the representative(s) the letter, I was reassured everything would be taken care of. I left paying a $100 diagnostic fee and nothing was done to the vehicle. At this point, the vehicle isn't reliable at all. I've already invested $1,200 into fixing a hvac blend door actuator issue that appeared shortly after its� purchase. I informed Ford margate about this issue as well; but as many times as I call, the issues get overlooked and forgotten about on their end. I only have 65k miles on the car & it rolls backwards if I'm on a hill. This happens as soon as I take my foot off the break and I anticipate hitting the gas. Before I can ever do that, the car starts rolling backwards as if it's a manual. The transmission consistently shutters and the gears don't automatically shift properly. Is there any way you can look into these issues?.