Please help me to unsubscribe...!

Belle journéeA slight problem...

I unsubscribed to the 2 IETF newsletters  :
ietf-request(_at_)ietf(_dot_)org <ietf-request(_at_)ietf(_dot_)org>  
and
ietf-announce-request(_at_)ietf(_dot_)org 
<ietf-announce-request(_at_)ietf(_dot_)org>

but it seems that it failed finnaly as i continue to receive emails...!!
Although i received a confirmation by majordomo...

Please who could help me ?
Thanks.