Gocomputersupplies.com Customer Service Issues

I purchased an HP 11A (Q6511A) toner cartridge for my laser printer from your company via Amazon.com, receiving it on 10/1/18 at a cost of $[redacted].49. I anticipated using it when my current one ran out. Upon opening the new cartridge last week, I discovered it was defective. Amazon.com indicated the return policy was 45 days and that my refund request was beyond the timeframe. Nevertheless, I seek compensation for the faulty product as I relied on its functionality when required. The cartridge was part of our inventory for future use like many other companies. Despite not finding your return policy on my order paperwork, I emphasize the significant impact of losing $[redacted].49 on a small company. I await your prompt response and can be contacted at [redacted], extension 3.