Seller won't answer my questions re how to get free updates on the GPS unit I bought.

I purchased a GPS unit last year and after having it for nearly a year, I contacted the seller  as to how to update the maps.  As there are no available drivers (none on the website),  I was informed that I would have to purchase a memory card.  This means that an update is not free and would take some time for me to get the card.  I have repeated asked either how to update for free (as advertised) or if that is not possible, how do I return the unit.  It is outside the 30 days return but it was before I had had it for a year.  Have I bought a useless GPS unit?

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As kop said, there is not much you can do, actually nothing in practical terms.

You could leave a follow-up to your feedback, but it won't solve the situation, and if your feedback was positive probably nobody will look at it after a year (people usually look at neg or neutr fb, or really recent positive fb).