my employer switched payrolls and claims that they will "always" be two weeks behind, therefore, two weeks that we worked for, we are not getting paid

Employer owes you for the work that you did. The employer must pay you for the work that you did. The employer can change the timeframe for paying you. For example, he can pay you on the 15th of the month for the work that you did for the first two weeks of the month. You can reach out to the New Jersey Department of wage and hour for the remedy. You can reach out to an attorney for the remedy. The attorney response will be more expensive. However, they turn a response will be much quicker. Please call if we can help