I took my vehicle to a garage to fix a power steering leak in my Toyota Corolla AE100 1991. They said that they have to replace multiple parts. So I provided parts for them. And then they told me that "We can't take the responsibility because the parts I have provided are not genuine" and as I assumed the problem was not fixed. The leak is still here. The parts were bought from a reputed store (KOYO brand). What should I do? I had to pay the garage and without them fixing the problem. Please help.