How to cancel an offer letter which is appearing on the system to join a new company?

Dear sir/madam,

A company issued me an MOL offer letter but I didn't sign that as I got a new offer from somewhere else.

But the new company PRO says that the contract issued by the previous company is still showing in the system. I called the previous company, they said they will not cancel it until I pay them.

But I didn't sign or put a thumb impression on any contract. Then why is it showing in the system?

Please help!