A formal letter of complaint about a hotel

Dear Sir/Madam I am writing in connection with my recent stay at your resort in Rethymno, Crete. Unfortunately, for all 7 days of my vacation from June 10 to 17, I did not encounter a possibility to utilize bathroom properly. When I checked into the hotel, I immediately discovered an issue with the plumbing. The water was barely coming out of the tap, and it was cold. The receptionist explained to me that these were temporary problems and that within the evening everything would be working. On the contrary even at the end of the next day, only a cold trickle flowed from the tap and I asked to transpose to another room. However, the staff claimed that they underwent a lack of rooms. I was not offered any alternative and options for how to solve this complication. Simultaneously, at this time of the season, all inns have already been booked and I could not relocate to another accommodation. After 4 days, I managed to be moved to another vacant room, there was a good pressure in the tap despite the water was extremely cold. In the morning, I found out that the solar boilers were malfunctioning in the hotel and there were no electrical ones, which the management were aware of a few weeks prior to my arrival and did not warn me. I am shocked at such a terrible service. I demand a partial or full refund of the payment for the accommodation, since the administration assured me to provide hot water which was not available throughout the entire vacation. If you do not proceed with any decisions and actions regarding this situation I am prepared to apply to a higher authority with my complaint. Yours faithfully, Mrs. Alexandra Butlitsky