Oibaf

Hello, I am running a squarespace website in Germany. Unfortunately I got a letter from a lawyer last week. I have to pay a fine for using google tag manger on my website without opt in cookie banner. Fist of all the squarespace cookie banner is not compliant with European law. This can be solved by third party providers. Anyway I have never installed google tag manger! How can I remove it? Kind regards Fabio Rimoldi