Punctuality of Group Instructors and clarity of class times

I have been both a member or and an Instructor for Virgin Active to years and have just noticed there is no place to complain on the website...... And unfortunately, Virgin, I have a complaint.... I have only recently reactivated my membership after freezing it during Lockdown and am very disappointed at the lack of punctuality of the Group Instructors. When I was an Instructor I was expected to be at the Club 10 to 15 minutes before my class and punctuality was expected. I have been going to numerous group classes and they either start late (with no apology from any of the staff) or finish early. Or finish late - per the timetable. It seems to be unclear or inconsistent as to whether classes are 45 minutes or an hour and randomly change between or even beyond those times. With me working from home and able to fit in classes during a lunchtime or between meetings, knowing when a class starts & finishes and getting a full class that is worth the money I'm paying you is an Absolute. Please fix this!