I would like to know why my account got Banned

Dear Nulls Staff Team,
I got banned today and would like to know the reason for that.
ID: #QR8VJ20Y8
Clan: GRENOBLE (lvl 7)
Username: GRE(german flag)zwetchge

Due to sent spam messages.

Could you send me a proof or anything because I don’t remember that I spammed or did something like that. And is the account now for ever banned?

This is permanent ban.

Sent proof