How do you get an owner that you used to work for to pay you for driveing for him for 2 weeks?
Ask him?
Seriously, I have seen this situations escalate needlessly due to a lack of communication between the driver and owner.
The first step on your part is to keep accurate documentation of all monies due per your contract during the time in questions.
The next step of course is to contact the owner and calmly explain what is due to you and then have some type of meeting of the minds as to when and how you will receive that money.
If this is unproductive and a "meeting of the minds" is not reached then you would need to put your information together in a well laid out written request that could be used as proof of notification in court at a later date if necessary.
Keep in mind that your contract is between you (the driver) and the owner exclusively with absolutely no responsibility falling on your Carrier to mediate or intervene. That being said, it certainly doesn't hurt to notify the Carrier of this situation, but only after you have made all reasonable attempts to works this out through the steps above.
There are many ways to handle these types of situations. This is just my suggestion after seeing situations were if things were simply communicated calmly and clearly it could have been resoved.
Your final avenue would be to sue the owner in small claims court.
Good luck