Ecoboost 2.3l In for service check engine light, hard break peddal, no acceleration..

Ok, so may car is currently at the dealership 2 days ago I was driving the car and the low oil pressure light began flashing, I checked the oil, the levels looked ok. I changed the oil myself less than 400 miles before this started happening. Now at the same time as the oil pressure light comming on the break peddal began to be rock solid and hard to press, verry scarry while driving. When pressing my foot to the floor the car would not accelerate. Today the service manager calls to tell me that the break pressure sensor on the back of the engine went bad and thats what the check engine light was on for. He procedes to tell me the oil was low when they drained it only a qt and a half-2 qts came out of the engine and it was black. How is that possible when I just filled it with the correctly specified oil and filter. I asked him this and he had no answer but that at high rpms the car is comsuming oil but that much? I can understand 1 qt but 4-5? and I just checked th oil level the day before I had it towed to the shop and it was right at the top but black (these guys are lying to me or something) He says judging by your back tires you drive the car aggressive and it may be why its losing that much oil. They also said that the metal clanking grinding sounds went away after they changed the oil. I asked them to do a pressure leakdown on the car and they wanted to charge me. He was trying to say oil hasnt been changed in over 7,000 miles bs because last time "they" changed it was 7+k miles ago. They didnt want to believe that I did my own oil change with the ford oil change kit I have records of the oil change. I dont feel like they are correctly servicing my car. They dont want to listen to what I am telling them and I am very displeased with their service. To tell me that I dont check my engine oil levels or change it. I have records of all the oil changes. car has almost 12,000 miles on it.
I also asked them if they drove it, they said only to the lift. Tomorrow they are replacing the break pressure sensor unit. And they better test drive it.