Uncomfortable - the heel stretched out - Crispi Monaco GTX Backpacking Boots - Men's

I purchased two sizes of the Monaco GTX to ensure I had the correct size. I then wore them around the house for two weeks, and over that time, they felt fine. After two long hikes, the heel of the Monaco's stretched and are now uncomfortable. When I contacted Crispi corporate, they told me there was nothing they could do, and I could try some different insoles. With their customer service, this is the first and last pair of Crispi boots I will ever purchase. I’ve owned three other pairs of Kenetrek boots, which are great, but I will never buy another pair of Crispi boots because of their customer service.