These things are usally made from substandard parts i'm afraid. They are built to last maybe a year or two at best.
Unless buying from a reputable manufaturer this is what happens. Cheap is not always the best way to go as well you have learned
Have a look at these...
Lots of phones and tablets have this already built in via the "accessibility application option."
It will vary from phone to phone. But I know my Samsung s6 has it and all the iphones I have used have it.
Also google has it for maps and browsing etc
Here is Apple device...
Don't buy a disc version of Windows. Simply download it from MS website and but a legit key from a rep provider
£10 for a Windows 10 Key
Let me know and I will PM you the site. Not sure if a link is allowed?