ISO Advice on a 6' fence placement - is it LEGAL?

[Ann Ngo]

Recently, I found out that my 6' fence to my new (to-be-built) house is placed on a decline (hill) so that when I stand on the property, the fence is actually 3'. Is this legal, given the description from the builder that fence is 6'?

Has anyone had this happened to them? What are my options to place the responsibility on the builder?

Thank you in advance for your guidance!