The strange part is there was no warning so i could stop doint bad things. Also, the amount of spam was around 20-25 messages per week. One of another accounts of mine was banned for same reason but only for 7 days. Also the "7-day" banned account is Newbie, while main acc is Member.
There doesn't need to be warnings for you to stop spamming. If you took the time to read the rules you would know that spamming isn't allowed.
Also as Lutpin mentioned, You should not post anywhere except on Meta until your ban is lifted or it will be considered as ban evasion.