Yes, the brand Tupperware is an mlm and sold directly by sales people. Back in the 50s and 60s Tupperware parties were a thing.
The confusion is likely the whole q-tip/Kleenex thing. We call it all Tupperware but really it is not Tupperware brand most of the time
Just because it is in your contract doesn't make it legal!
Realistically it could be worth checking your local laws regarding it and potentially speaking to a lawyer as some will do a free consult to see if you have a case