Engine Noise problems of the 2015 Ford F-150

Sadly, we feel we have purchased a lemon occasionally engine or transmission squeals/grinds, if accelerate too quickly/power up. ,and now, on cold days [temps low 40s & under] hear rubbing/grinding whirring at left front tire? gets louder when depress brake, and can feel in brake pedal. Sound occurs during slow forward speed 2-40 mph, on gravel driveway or paved road. Scheduled service today for noise; they were more interested in fixing recall item [locks - rpr time 3+hrs], if they had parts in stock. Recall srvc completed [under 1 hr], and "no noise was heard. " I requested further look for cause of noise, service advisor said quick lane would check suspension?. 2 hrs later, nothing seen, nothing heard, nothing repaired. As I pulled away from dealership, having signed off on service, the truck immediately began making the noise [funny serv advsr didn't hear when he brought truck around?]. I drove less than 1/10 mile back to dealership, took the service advisor for ride; at which point he acknowledged he heard noise, but tried to assure me it's a 'tire issue. ' my husband and I believe otherwise - this is not tire noise, the noise never crescendos or changes pitch with increase or decrease speed, on gravel or asphalt, and we have never felt 'tire noise' in brake pedal. This noise/friction merely ceases after you've driven a few minutes [for now]. Service advisor assured me I was not doing any further damage to truck, continuing to drive it without resolution to the problem. I asked him if I needed new tires, he said indeed not, mine are in great shape [original tires] with 63,000 miles on them [but it's a tire issue?]. Something's up [similar concerns have been raised in forums on the internet- along with dealer dismissal/failure to resolve. We want our truck repaired [resolution of these mechanical failures] while it's under warranty, or we want a new vehicle.