Some other parties do send renewal announcements for domains which are not registered through them to domain holders, often with bogus and overpriced renewal rates, sometimes also with non-obvious transfer attempts.
Please disregard any such offer or notice which is not from Joker.com, or your responsible provider!
Unfortunately, there is not much we can do about this, since these parties usually are not within practical legislation.
But please report this to ICANN.
If you get such a notice, please visit Joker.com to check your domain's status before following any other "renewal procedure".