Repeating the same thing, sending multiple messages after I sent one message

It wasted a lot of my free credits for the month on repeated paragraphs that were slightly changed. I had to delete a lot of them because they were cluttering up the page. It also cut my campaign short since I cant continue now after he sent like 4 messages each 1 message of mine with only the tiniest bit of more information on each or even changing whats happening.