Hi Youssef! My agriturismo is also a farm who produces and sell products and you bought a bottle of olive oil, eggs, tomatoes, home made jam as well as 2 breakfasts (which are not included in the price as it is stated in the announce and as I told you on the phone). So, the extra euros you paid were not due for the towels, but for the products and the extra service you asked. I guess you did not understand my mother's Italian.
BY THE WAY: we noticed that one towel is missing from the apartment after your departure, I guess you took with you. If this is the case, you should refund it.