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It is the part of Customer side, if you satisfy your customer and resolve his/her all queries. If you will try to resolve and will offer the customer with that product and solution which they demand, at the ground level, then you are at the best side of CS
Yes it is, and if do not know the answer you should something like" Thats a great question, let me find out." then find out the best possible answer and explain to the customer to ensure that he/she understands to their satisfaction.
