Woocommerce Updates Change Cart.php

A few months ago I realised that some people were buying items in my store for 0.00$. After some research I found out the problem was the “remove” action. Whenever you remove an item it will remain, but it cost goes to 0.

I could not find a way to fix this so the solution was to block the removal and to implement a “clear cart button”.

This was working fine until the 0 cost carts appeared again. My “clear cart button” was not working anymore and the remove function working again.

First thing I can think of are updates, maybe every update of woocommerce is restoring the cart.php file (thats the file I edited). Since there are not new updates I can not confirm this is the problem.

So i have two questions, ¿anyone know if the updates are the problem? and, if they are ¿is there a way to prevent this to happen?

Thanks in advance for your time, this matter is keeping me busy and I can not find a way to fix it.