Should the common green scrub pad (the ones one would use to scrub pots
and pans) have scratched the granite tile? Is there a chance that
these granite tiles are cheap. I purchased them from the "Tile Shop"
which claims they are 100% onyx granite.

You may have a case against the Tile Shop.
Onyx is a sedimentary calcium carbonate rock similar to limestone, and is
very soft and scratchable, and is IMHO unsuitable for a working kitchen
countertop, but may be used, with care, in bathrooms and showers.
Granite is an igneous rock cooled from magma, and solidified into extremely
hard interlocking crystals of quartz and feldspar, both minerals way
exceeding the strength,hardness, corrosion resistance, and durability of
limestone or onyx.
"100% onyx granite" is therefore an oxymoron. It may be possible that you
actually have granite there, but the softness sounds suspicious if a scrub
pad abrades it.....