أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
By not creating promises for the request done by the customer. By informing about the can do's & the other alternatives. The policies & procedures of the company can be explained as well. If all those facts can support the declining of the customer request, you may go ahead & decline the request in a polite, professional & a respectful manner.