The affected customers posted on social media about the move, which prevents them from taking advantage of any Amazon services including using devices like Amazon’s Kindle and Fire TV, Business Insider reports.

Horrified that @amazon canceled my account w/out any notification. Been a Prime member since 2006, & an excellent customer. I have a GC credit on my account & thousands of books that I’m terrified that I’m going to lose access to. Movies, too.

Has this happened to anyone else??

— Jess Lynn (@JessLLib) March 30, 2018

Day 5 of @amazon not giving an explanation why after being a loyal shopper since 2006 they just canceled my account with no notice whatsoever right after they charge me $101 for #amazonprime. That makes total sense. What happened to my response back in 2-3 days?😬 #amazonfail

— Amber 🪩 (@ambershustles) April 4, 2018

https://twitter.com/markle_darla/status/980279638021758979

One customer that spoke with Business Insider says she’s spent hours on the phone with Amazon and has only said she’s violated the company’s review policy, although no specifics were shared.

In a private Facebook group for customers that have been removed from the service, a few members have admitted to violating Amazon’s review policies, which include reviewing items they’ve received for free to at a discount or leaving a positive review in exchange for a reward. Others have claimed that they have no recollection of violating any of Amazon’s policies.

“Amazon has taken action against bad actors and those who have violated our community rules, an Amazon spokesperson tells Fortune. “If any customers believe their account has been closed in error, we encourage them to contact us directly so we can review their account and take appropriate action.”