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I am sorry to hear this. There is no appeal process unfortunately.
What you have to do is reapply but you have to make sure you have more information to provide or you will not be successful.
For example, if your spouse has employment in Pakistan prove this.
Prove that you have other ties to the community aside from your employment and your assets. Assets can be moved and your spouse can move to Canada too. So you have to show why you must go back to Pakistan.I suggest having the letter of invitation redone and have it stress that you are needed in Pakistan by the company who wants you to visit here but clearly wants you to remain in Pakistan to further your business relationship.
It may be best to consider retaining a lawyer in Canada to assist with the new application.