I rang up sky as I was unsure of specifics of a laptop, I got passed onto Jeff who was very helpful and after I decided to think about it he offered to ring me back when it was convenient for me, I missed the first call but he left a very professional voicemail and proceeded to tell me when and why he would call me again and the exact time I asked for he was calling.
Unfortunately on this occasion I didn't end up buying with him due to buying online but I only bought it because he is was very polite, professional and amusing!