Off Sushi !!!!!!

I bought a sushi platter for 1 and the tuna rolls were all off! Tuna has a distinct pink/grey look and this one looked brown and the moment I put it in my mouth I was so disturbed! Sushi is meant to be pleasant and we are meant to trust the chefs with our lives but if the restaurant is serving off fish then they need a negative review published! Just because I order online doesn’t mean I should get the s****s because you think I won’t escalate the issue!