Frustrating Operations Procedure

I have dealt with Samsung Repair Centre Umhlanga Rocks for quite a while their service I have found is good but their operations criteria frustrating. They will only service or pick up unit pn certai days depending on the area you may live, which is understanable. What though is very frustrating is that on day of service or pick up they will confirm day of arrival but not actual time until half hour before arrival. So for multiple days you could sit the whole day awaiting their technicians or pick up and only when they phone 30 mins prior arrival. If they could cut the day and 30 mins notification into morning or afternoon it would be less frustrating and minermise customers wasted time.