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Hi, thanks for your question. Wow, that sounds like you had a nightmare with those toners!
Our Guarantee on compatibles is for 3 years and covers the printer as well. If there are any issues at all, we'll fix or replace the printer. What I would say is that sort of thing is extremely rare and in the 16 years I've worked at TonerGiant, over many tens of thousands of orders, there are only a handful of times I've experienced this, and we've always sorted the problem out where the compatibles caused a problem. We do our best to make sure our cartridges are manufactured to a very high level, as it doesn't make sense for us to sell a lower quality product that can cause a lot of issues.