Need help with incoming traffic!!!

[mediashooter]

Good time of day!
Guys need help here in what!
Called techies provider told about incomprehensible incoming traffic on my ip address that supposedly loads DNS addresses! Asked to block incoming network traffic 53rd port!

How to block incoming traffic on port 53!? Please help me, point to the right path!

[doktornotor]

All incoming traffic is blocked by default on WAN. Impossible to advise with virtually no information on firewall configuration and the "offending" traffic available. Plus obviously - no amount of blocking will stop incoming DNS queries from coming in, maybe the ISP should get a clue instead.  ::)