If you put on different tires and the noise is still there, then it probably isn’t the tires.
But you said they ordered 2 tires (not Dunlop). Does that mean that you only replaced 2 tires and perhaps the 2 old tires are the ones that are the problem?
Please help us by describing the noise. A buzz, whur, zzzz, etc. would help us determine what the noise might be.