Answer:
"Cold calling" or "cold messaging" is of the most irritating methods to the potential customers.
This is because cold calling tends to be very long. It is time wasting and frustrating to the listener, especially when they are not interested in the advertisement, acknowledgement of the products. In addition, this method has the characteristic of unprofessional and like spammer. Cold calling makes every listener the same and it can make the potential customers irritated feeling they are not respected by the firm.