A contract binds at least two parties to perform an obligation. Therefore, when one side breaches a contract and refuses to fulfill what is agreed upon, this might lead to complications.
Depending on the type of contract, the procedures for terminating it before the start date can vary. Some contracts contain a termination provision, while others make no mention of it.  A professional attorney should review and clarify the contract.
A professional attorney should review and clarify the contract. Typically, suppose you want to terminate a contract. In that case, there are very explicit guidelines regarding how and when to give notice, who pays for what and when, what happens to any data or materials created during the term, etc.
In addition, every contract stipulates what happens to the terms and circumstances of the agreement if the parties violate the regulations or if something modifies the agreement during the performance.