Hot spring Hotels in Garmisch-Partenkirchen

My overall experience with this hotel was bad, unfortunately. Even before my arrival. By mid-October, I booked and paid in advance a 2 nights stay at Mercure Garmisch-Partenkirchen, from the 1st to the 3rd December. A couple of weeks later, I realized that I made a mistake with the dates, since the right dates for me would be from the 8th to the 10th (the weekend afterwards). I contacted both the hotel (which took a long time to answer) and the ALL/Accor customer support and asked to move my reservation (already completely paid!) 1 week forward, also 2 nights, also from Friday to Sunday. After a few more days, I received a final answer from Mrs. Eva Binder (Hotel General Manager), wrote me that the rate I chose was not flexible and not refundable, that she had “hands bound” (her words) but I would be offered 15% discount for a reservation in my desired dates, as a gesture of good will… Let’s put this into numbers: I had already paid 160,20€ in advance and the hotel already had the money! But since the hotel refused to move the dates, if I would make a second reservation, I would probably have a discount of 24€ (if I would achieve the same rate), but would still lose the paid 160,20€... Based on this scenario, I had no alternative than to stick to the originally booked dates. This was not what I expected after 12 years of loyalty to the Group, and have reached Platinum and Gold membership levels (currently Gold). Before driving off from home, I tried to do the check-in online, as I always do, but even this was not working. When I arrived at the hotel, the reception from the staff was somewhat cold and suspicious. They could not find my reservation, even when I showed the booking code on my phone. It took minutes until I got a room (I was even invited to sit down and wait), and the receptionist then came to the room with me to check if there was someone already there (!)… Never had this situation before. I presented my membership card (it is still a Platinum, because when I moved to Gold, I never received a new one). This should have dissipated some tension and should have triggered a welcome drink automatically. But neither, nor. Then I asked the receptionist about my welcome drink (due to my loyalty level), and he said he was busy, but I could get it later. I allowed a couple of minutes and went to the reception and got the drink, when a power surge happened (of course this has nothing to do with the hotel, but the system went down and the search for my reservation could not take place – therefore, I went to sleep). Please note that the power surge was about 15 minutes after my arrival, therefore cannot be used as an argument for not finding my reservation, even after showing its code. Next day was a normal day for me (in the morning I asked if they found my reservation, and the answer was yes – that made me feel relieved and I thought finally everything would be ok.). But in the evening, I went to the reception and asked for recommendations