The GDPR does not specify what a valid request to erasure entails. An individual can make a request for erasure verbally or in writing. This request can also be made to any member of your organization, not just to a designated contact. As long as a request meets the conditions above, it is valid, even if it does not refer to “Request for Erasure” the “Right to be Forgotten,” Article 17, or the GDPR.
There’s no template to follow for a request. Once GDPR is mentioned, they usually just email back saying that they’re doing it or its done.
I haven’t come across any difficult companies but I’ve heard some make it as hard as possible and follow the Erasure Request form template in the link above and ask for proof of I.D etc