Router upgrade

Or maybe 5 months ago I upgraded my internet to Platinum. The tech came and brought a different router. He said the one I already had was not advanced enough for the higher MPS speed and that I needed to take it and return it and have it adjusted. At the same time he brought me a router that he said should work but I should take that one and have it adjusted as well. I just feel like he should have been doing that or was it my responsibility?