Yes, you can counterclaim for breach of the implied covenant of good faith, which means that the other party has taken steps to prevent you from obtaining the benefit of the bargain. The original agreement was an exchange of what was expected to be reasonably equivalent value for services rendered.
However, when the other party, stopped accepting your services, and procured them elsewhere, they obtained an unfair advantage, and breached the covenant of good faith that contemplated the equivalent value of services under the agreement.
If you win that claim then you would have damages for the lost profits from their taking their business elsewhere, and for reliance upon their misrepresentations, which could give you damages for what you would have received had they not diverted their purchases.
Hope this helps.
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