I would use the consulting company's open door policy and go up the chain... right to the country lead partner and mention this to them in writing. Believe it or not ethics is extremely important to consulting companies as trust and future work depends on this - and bring up any fears of being dismissed for bringing this up to their attention.
Company open door policy exists to protect the company. Even the HR is there to protect the company. Even in US, whistle-blowing or rocking the boat will result you in being fired faster than you can say Oklahoma backwards.
