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Does this mean the service provider is wrong, even if they have been trained and well prepared for the job?
It doesn't mean this at all. The quotation provides us this understanding that we should always be prepared mentally to satisfy our clients by extraordinary level of service. It can only be done by providing right answers to their arguments in a way which satisfy them and not by tit for tat.
The client right up if we were are not convinced must study our clients meet their needs so well