yes you can, 'each' is singular

A clients demand should be handled as quickly as possible. Any business wants their clients to be happy. Take care of any client demands and a client will be satisfied.

A estate agent is responsible for different tasks. Sellers and buyers of the properties have their own requirements and terms and conditions, and a estate agent has the responsibility to make their clients satisfied with their works. Estate agents have to search the property for their buyers and have to search the best buyer for their seller clients.

TSR means Technical Support Representative in BPO (Business Process Outsourcing) companies. It functions as dealing to technical concerns that will satisfied clients.

I would treat my customers with outmost respect and I would try to keep them happy and satisfied. I would remember that they help pay my salary with their business.