Useless On-line booking system and staff

I have complained about their on-line booking system for the last 3 - 4 years, but despite promises to look at it, nothing has changed. If you want to book at a specific place, but doesn't have a specific date in mind, you can't put a time-span in like other holiday places, which means you have to go back and change the dates every time to see what is available. It is ridiculously time consuming and frustrating. Due to this useless system, they force you to phone the booking department and PLEASE don't put your name on a list, because if you ask for a weekend, they change it on their own discretion to a week and if something is available, they expect you to take the whole week and find somebody to utilize the rest of the week or lose the points!!! Then IF you phone them, you have a waiting time of more than 30 minutes. We phone from cellphones and 30 minutes will use most of your airtime and then you still don't know if you will get a booking at the place where you want to go, as most places are usually fully booked anyway, except the one where nobody wants to go. If they will just improve their on-line booking system I'm sure they will have a lot less calls to manage.