Actually as the retailer they would report the issue to Dell and then Dell would be responsible. The Microsoft Store might have once given a refund for return however I do not know the timeline they work in for such units (we also have no contact or connection to the store). If you want to have the unit fixed (if possible) you will absolutely need to work with the OEM Maker which for your unit is Dell.
Microsoft knows of the issue which is all an MVP can do. Now it is up to Microsoft, Dell, Lenovo, or any other OEM device maker of those touchpads to come up with a solution. So if you want a resolution to the issue then you absolutely need to work with the OEM Maker which again is Dell.
Very sorry however no one here can offer any real help as we don't have a hand in making the device or writing the drivers. Dell does.
MVP's are volunteers who are offering free support. If I had the issue I would be at Dell and not here. Of course you could always take your case to higher level Microsoft Support which will at present send you back to Dell.
Microsoft MVP - Overview
https://mvp.microsoft.com/en-US/Overview
Rob - SpiritX