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For some very specific reason, I need to create 4 virtual interfaces with different MAC address on each virtual interface, the frames from those interfaces will needs be sent over a single physical interface without any VLAN tags (the device on other ends will look at my PC and thinks my PC is a dumb switch because frames from different MAC address is being sent towards them)

I've tried this command ip link add link eth0 name untagged type vlan id 0 which managed to create an untagged virtual interface but when I tried to create another one and replace the 0 then it said RTNETLINK answers: File exists

Again, I'm not trying to create a trunk over the physical interface, a tagged frame being sent out the physical interface is not suitable for my purpose because the other end doesn't understand a VLAN tagged frame or a trunk interface for that matter.

How I could accomplish this?

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    Try a "macvlan", which you can see in man ip-link Commented Aug 17, 2019 at 14:44

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Thanks to LL3 I found out that this feature is called macvlan, for your reference I'll put the command here:

ip link add link eth0 address 00:cc:cc:cc:11:33 eth0mac2 type macvlan
ip link set eth0mac2 up

Source: https://serverfault.com/questions/576337/macvlan-interface-and-ppp-session

This can be used to create a L2 virtual interface for PPPoE

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