Bests & Worsts Reviews from Amazon

I bought $200 worth of this product and appear to be stuck with it as there is no option to return, likely because this is a medication. For reference I have returned one Amazon item in over 15 years, a book which was missing a bunch of pages. I have taken omeprazole for 20 years. After four days of taking this product I had bad heartburn. Doubled the dose with no effect. Bought a package of brand Prilosec and was fine in three days. Switched back to a different box of this shipment and had heartburn again in three days. I would have happily contacted Amazon or the manufacturer instead of writing a review but there does not seem to be a way to do this for medications.