Need to know more.
Did the efflorescence develop after you installed the pavers? If so how long after.
Or did you install the pavers with the efflorescence on them?
If this is indeed efflorescence, technically the manufacturer is under no obligation to offer redress.
What did the manufacturers rep tell you?
What did you scrub the pavers with? Hopefully not muriatic acid.
Are they antiqued or pavers with Paver Shield?