The 511 team will have to help you with your request. That said, you didn't need a new API key, rather you needed the 511 team to increase your existing API key's limit on their backend. However, since you've now published your API key anyone can use/abuse it so now you DO need a new key.
I would recommend in the future that you _never_ publish your API key(s) from any service(s) you are using to avoid people from abusing your approved access.