It didn't get him anywhere, in the actual vote to be mayoral candidate, and has now cost him a £5k fine
www.bbc.co.uk/news/uk-politics-35772202
Automated calls, whether marketing goods, services or political parties, are all regulated, and even though his thousands of calls led to only one complaint that was enough for enforcement action to be taken.
Worth remembering, just in case anyine is ever on the receiving end of referendum spam.