Do not call consulting company anymore. First write an email to your prime vendor mentioning that you have not get paid for work that you performed at client side and also mention that you are complaining this to your manager at client side. This way prime vendor will put pressure on mid vendor ( if present) and your consulting company. Also write separate email to your consulting ( your consulting HR, recruiter and point of contact) mentioning that if you do not receive your pay within 3 days of this email, your are taking this matter to state labor department where you performed work. In this way, consulting will contact you ASAP and will pay you.
This is my suggestion based on my previous personal experience. Hope it helps you. If you don’t mind please post the name of consulting company in this post when your issue is resolved and leave that company. Thanks.