Effect of evil eye

Q: Can evil eye from envy and such cause affects to someone’s physical appearance or lifestyle? If someone gives you evil eye can it do stuff like ruin skin and change the way you look?

Saying "madad 'Abdulqadir"

Q: If someone asks is it permissible to say madad 'Abdulqadir or Badawi or Naqshibandi (or the like), what is the answer to this? Meaning, does Sayyid 'Abdulqadir (or the like) hear when someone says that from a far with the permission of Allah? Is there any other meaning of madad? 

PS - I'm learning aqeedah and I need an explanation of this. Linguists say that ibadah is not defined as merely calling or asking for help from someone. Subki rahimehullah says ibadah is ultimate submission and subjugation. How can I understand the given topic.

Responsibility of fixing a car that broke down while test driving it

Q: Please advise me on how to go about this problem: 

I smashed my brothers car so I decided to replace him with a very similar car. I saw the car in some pictures which was being sold by a reputable trustable person. After speaking to the seller on the phone I was happy with what he told me about the car. But the seller told me its better I first have a look at the car, drive the car then we will speak about method of payment. We agreed on a meeting point. 

The seller drove for about 150km. My brother went to pick up the car and drove it for another 200km and as he entered the town before reaching home, the car broke down. 

Am I responsible for the breakdown? Please advise on whats the way forward.