On repeated messages by you and they are not replying, that is clear they are not interested or taking your views lightly, take the pictures of the leakages and problem of bathroom that would be helpful in future documention. Try to sort out with your apartment landlord, if not listening to you file a complaint with RPA. Because for your matter if you take to court, which ofcourse should be a last resort takes longer time and also waste of money and landlords are healthy with money in this court cases, so best go ahead and file a complaint with RPA and they will contact your landlord with all documents and details you will provide and hope the issue is going to resolve soon. All procedure is online and very simple to use. Filing a complaint RPA link: https://www.rentalprotectionagency.com/complaint_center_form.php