Replied "stop" to stop... But it is annoying to have them texting me like this. Oh well, reported into the Do Not Call registry and the Federal Bureau of Investigations.
Spectra 1-1's profile and activity

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Robocall for some cruise. Very annoying and does not obey the do not call laws. Live agent was rude and belligerent when I asked not to call back.
Caller: Green City Cruises
Did not answer, left no message. Looked up number, belongs to Portfolio Recovery. These vultures are harassing me and others for years now. Recently I have started reported them into the FBI for scamming people. I do highly advise everyone who was called by them to do so. Now every time I get a call from them, a report has been filed for each time they call me.
Caller: Portfolio Recovery Associates