I only to advise another problems facing to block this traffic.
1) I cannot use a mask ( like * ) to implement rules inside of Layer 7 FW, so only entire and exactly URL to match which will increase more line in my rules
2) I didn't find way to specific a message regarding this rules when I have match on it ( like hits ) on the line and the same time a message could be informed as default for the user ( when user access by browser saying, maybe " This is not permitted in this environment " )
The only way to block this traffic was defined rules inside of MX ( Outbound Rules - Layer 3 ) on the specific VLAN using only a mask on the begin of URL ( *.whatsapp ), again cannot use a mask ( like * ) on the finish of this address.
Then, I will make wish on the portal in order to ask more attention.
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