lost my faith in CA  pls advise....

hello every one im doin articleship . recently i did a tax audit. my principal told me to do purchase vouching only and expense vouching.but my principal in order to reduce the tax liability of the client increased tranportation charges by 8 lakhs . donations paid were treated as office expenses and rent paid for which no TDS is deducted were not disallowed. he also increased othr expenses to reduce profit. the profit of the firm was about 80 lakhs. he reduced to 35 lakhs. wat should i do.. iam really afraid.. i lost my faith in this proffession. pls some body advise me...