Parasitic traffic from clients. Can it be removed?

Question

Mikrotik

Hello. Straight to the point.
We provide communication\internet to clients in the villages.
We do not use QinQ.
There is Vlan on the Internet.
There are some clients who somehow broadcast all traffic to the Wealan. Packets go through everything they can.
These subscribers have routers - TP-link 740
There was another moment when some corp. subscribers were planted in 1 vlan (do not ask why). They had a pfsense router and in a similar way they clogged the radio link (about 10 Mbit of spurious traffic).
I rummaged through the entire pfsense and did not find anything like that, and I even caught packets from my PC, although I am far from both the main gateway and this client - but I am in the 1st vlan.

Answer 1

Apparently, customers have bridged their WAN with LAN interfaces. This traffic cannot be removed in any way, it will reach your devices anyway.