You can delete a contract on Deel provided it's not active yet.
Here is how to delete a contract as a client
Go to Contracts
Identify the contract you would like to delete
Select the Bin Button in order to Delete the contract.
If you do not see the Bin Button, then that implies that the contract is currently active. To terminate a contract which is the first step, you will need to end the contract first before you can delete it.