Play dirty right back at them.
If you get a job at Corporation-X your wages can be garnished for failure to pay a debt. If you own your own business and a your corporation is employed by Corporation-X your business can't have it's income interfered with.
How you get paid by your corporation is not fit for discussion on this forum.
Note: This applies to Canadian tax/debt law. I don't know how well it works elsewhere.
If you know a doctor who owns their own practice ask them 'how they do it'.