Discovery Insure Call Centre - Rude much???

I have blocked them on TrueCaller because I know it is a spam caller, they have missed call me 23 times in a span of not even 10minutes, when I have unblocked the number to confront the caller he asked me should he phone back... Uhm... hell no... there is a reason for blocking your call, when I've told them I am not interested in their services he put the phone down in my ear without any further conversation. I am a Discovery member, and if I wanted to change to their insurance I would have... Call centre personnel, in general, need better training or huge attitude adjustments, you need me more than I need you my friend, the companies which they work for will lose business with such rude attitudes, and arrogance.