You will not be able to cancel or void forms that have already been submitted to the IRS/SSA.
If an order has been placed on the E-File site then this means you have submitted to the IRS/SSA.
Below image shows the "Place Order" on E-File site:
NOTE: If a duplicate form was accidentally E-Filed then please reference Support Article below:
How-to-File-a-Correction-Form-on-the-E-file-Site-from-the-Software
No credit will be issued for services already performed.