Its really important to know that there is somewhere to bring any complaint.
According to the website of the Office of Religious Services, there is now a national hotline for all issues related to Mikvaot throughout Israel. This includes related to repairs or complaints in women’s mikvaot. The hotline will work 24 hours a day, except for half an hour before Shabbat/Holidays until half an hour after Shabbat/Holiday has gone out. The idea is to give an address, in real time, to deal with the mikveh.
According to the announcement, all complaints that the hotline receives will be addressed immediately.
Phone number: 03 7563313
The original announcement can be found on the site of the Office of Religious Services.