Based on my experience, FreeScout is good, free and open source solution for implementing help desk. I worked with many companies that moved to it and are satisfied with FreeScout. In general, there is no need to add additional subscription cost to your budget, if you can have open source solution that works good and is customizable.
And if you are not techie and don't know how to implement FreeScout, you can always ask someone or some agency to implement it for you. https://itsfoss.com/freescout-open-source-help-desk/
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