Fear not, I have the solution! My boyfriend's dad works for Coomeva, one of the best private health insurance companies in Colombia and, a few weeks into my arrival, he told me that I could sign up for a plan through him. The plans vary from around $88.000 per month for the Silver plan, and $200.000 per month for the Gold plan. Had I known this was a option, I never would have bought travel insurance.
So, for any expats planning on coming, or any already here, if you want this insurance you can get in touch with me (click on the 'Contact' tab at the top or comment on this post) and my boyfriend's dad can set it up so easily and may even be able to give you a discount. All I had to give him was a copy of my passport. Problem solved!