I recently went to a garage to ask about different cars and offers, the salesman took some details; phone and email, when leaving I said to him I would be in touch if I wanted to proceed. He called me off the garage's phone and emailed me off their work email but I have been busy with work so missed the call and forgot to email back. I received a text from an unknown number asking if I still wanted the car, I replied asking who it was to which he replied: "it's X from Windsor's lol".
To say I'm furious he got my personal details from their system to text me off his personal phone is an understatement, I just want to know if this is a breach in GDPR or anything like that. Receiving calls and emails from the garage are fine because that is their work environment but when someone goes onto that system to get my information and use it this way is unacceptable to me.
I am looking to take this further and would just like to know my options here because who knows how many other people he has done this to, I have been in touch with his manager but got the feeling he thought X was doing an outstanding job by hounding me in his personal time.
EDIT: This question was purely to get some feedback and different points of view, I have/had no intention of suing the garage or pursuing that kind of legal action. I wanted to see which arguments I could raise when taking this up with the garage's head office, for me it is the principal of privacy and being a nuisance rather than any personal/legal damages. I feel some people may think that I am trying to make a claim, this is not the case so I just wanted to clear that up.