Bosch Dryer Stacking Kit and Free Installation Rights Dispute

I purchased a Bosch tumble dryer today via MediaMarkt online in Istanbul and the product was delivered today. The authorized service will come for installation, and I called in advance to ask about my right to a stacking kit and free installation, since both my dryer and my approximately 1‑year‑old washing machine are Bosch. On the phone I was told that if the stacking is done during the first installation, it would be free of charge, but that they would not give me the stacking kit, and that if I requested the stacking kit and stacking service later I would have to pay. I clearly stated that I want to use my right to free stacking in 2 years when I move to my new home and place the dryer on my Bosch washing machine, but they insisted that either it must be done now during first installation or it will be paid later. I find it unacceptable that the stacking kit is not given to me now and that I am told I will have to pay if I use this right 2–3 years later. I want the company to either deliver the stacking kit to me now free of charge, or to give a clear written commitment that when I request stacking with the kit in 2–3 years, it will be done free of charge within the scope of my right as a customer.