I'm sorry that happened. I know it feels like a slap in the face and it's never pleasant to be the one dumped. Given the choice, I would prefer to the the dumper. I know a lot of shoppers who have been deactivated by MF, although, cross-my-fingers, not me YET. I say YET because I believe sooner or later it all MF shoppers will be deactivated unless they live in an area with no competition and have some skill that no one else in the area has (for example, being able to do a shop in another language).
If they had deactivated you for some "bad" reason (like they thought they had caught you in fraud), they would have removed all pending shops and not allowed you to do them. Since they did not, they are deactivating you for some reason of their own. I'm surprised they gave you that much answer. Usually they just say it's confidential and they can't release the reason. In the case of the shopper not doing anything fraudulent, I think MF actually believes they are doing you a favor by allowing you to continue with any shops you have already scheduled. Even though you are blocked from current assignments, you will get paid for any shops you do. Do them or don't. Some friends have continued because the shops they had scheduled were shops they wanted to do. Others have canceled. If you don't want to do the shops, don't. If I didn't want to do the shops, I would probably send them an e-mail telling them if I was unable to continue working for them, I thought it best to end immediately and ask that they cancel the shops. Or go in and cancel them. It's really totally us to you at this point how you handle the next shops - after all, what are they going to do - deactivate you? If the money is good or the shops interesting, I would do them. If you were lukewarm about the shops, I'd cancel.