I am not disputing that the op has had problems getting payment. I am like most other posters here and have nothing but praise for Mintel. Solid MSC where every shop ever done has been fair to great value in pay. They have excellent communication and have always paid me on time like clockwork. I have only shopped for them on their proprietary site and not thru ISS.
My questions and suggestions for the regular poster
Did you check both your profile on Mintel's proprietary website and ISS to verify your name was correct as Lauren not Iauren and that the PayPal or Venmo address was correct?
If you had payment problems and got it only partially and not fully resolved, why would you do more work for them.
I suggest for you and everyone else to never continue to do work for an MSC that you are not currently up to date on payment per the MSC payment terms. If you loaned someone money and they agreed to pay you in 60 days, and you have not been paid 180 days later and they ask you to loan them more money only a fool does that. If they paid you late at 170 days and 10 days later ask for another loan, I doubt most people would loan them money again barring extenuating understandable reasons, they were so late paying the first loan. I know for one ShopperBob does not give 2nd chances and for the most part I don't either. Like I said there are few exceptions. Fool me once shame on you, fool me twice shame on me, fool me a 3rd time not going to happen.
Shopping Western NY, Northeast and Central PA, and parts of Ohio and West Virginia. Have car will travel anywhere if the monies right.