If a tax consultant made major errors on my corporate tax return, do I legally need them to redo the taxes, or can i have someone else redo the taxes?

I Incorporated in 2017 as a consultant and I did my own 2017 taxes with tax software. In 2018 I had a tax consultant prepare and submit my corporate taxes. I now see that expenses were doubled and taxes were not removed from retained earnings, among other minor things that i had questions about. I’m not clear if this is creative accounting or if it’s completely bogus. When I questioned them, they have given me many different and conflicting stories, so I would like to have my taxes reviewed by someone else, and likeky completely resubmitted for 2018. My question is, two parts. 1. Is it legally acceptable to have someone else redo my taxes? 2. is it more of a CRA flag or are there any other implications if I have a completely different person review and redo my taxes?