In this situation, you would resort to the enforcement laws of Saudi Arabia, specifically the Enforcement Law, Royal Decree No. M/53 dated 13/8/1433H. These laws would govern your case since the contract's jurisdiction falls in Saudi Arabia.
According to Article 11 of said law "The enforcement order must be served to the obligated against whom enforcement is required directly or at his address within the Kingdom."
This implies that you, as the obligee, are able to serve an enforcement notice directly to the defaulting party in Saudi Arabia from Pakistan.
The next course of action may be to initiate enforcement proceedings under Articles 46 and 47 of the Enforcement Law. As per the Articles, the enforcement judge may take necessary measures to ensure the obligator pays the due amount. These include imposing a travel ban, suspending the obligator’s ability to issue powers of attorney, and restricting his ability to deal with his assets and suspend his activity if he is a merchant.
The provisions of the Royal Decree are very clear in matters of international transactions. But you must remember that, until the court order is not with you, you should persist with your communication efforts. It is important to save all the correspondences between you and the other company as they can serve as valuable evidence in court.
Before you initiate any legal action, consult with a Saudi Arabian lawyer for more profound legal advice. It is always beneficial to fully understand the jurisdiction and specific laws concerning your dispute before proceeding.