Hm. Colonoscopy isn't the standard test to check for h. pylori. That's a bit more invasive than what is necessary. But so be it. 8 out of 10 people do get better with the standard treatment. So, your next option is to ask for second line treatment. The next go to treatment for those that do not respond to the first line.
They should give you the antimicrobial susceptibility test.
Here is a good article that discusses how to proceed. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3002558/