A Hectic Job....

i thought several times before writing this as i was not able to understand that what am i doing.i am working as an executive in an international call centre in the night shift.my job is to make calls to U.K and U.S and sell the product to the people living there.and i am doing my work with full devotion and dedication,however the problem is that sometimes people start shouting at us.basically telemarketing is a very good source of income for the government of the country to which calls are being made.people think that we don't have got any work and we are disturbing them.they don't think that it's just for their own convenience that they are getting products right ahead at their doorsteps which they want and they need not to go anywhere to get that product.this is for their benefit.and if somebody don't want that product then simply go ahead and say that i don't want it.what is the need of shouting or abusing.during our training session we are taught that u should treat the customer as a guest and should never say anything against him or never override his talk.that doesn't means that the customer has got the full authority to say anything to us.sometimes i feel guilty that am i really disturbing them or trying to get into their personal life.but this is my job and just foning at somebody's place doesn't means that i am breaking their privacy and after all this for their benefit and if they don't want these type of calls,they can use the D.N.C or CALL INTERCEPTOR servies.so am i really a CULPRIT??????