Hello,
Generally speaking, my customer service experiences in Dili, the capital city of Timor-Leste; are acceptable, although I cannot say really great. When I enter a store sometimes I do feel welcome, while sometimes I don't. I also notice that the store clerks most of the times do not smile. I don't know why. Is it just me? or they do it to customers in general. I don't always get useful tips and advice. Sometimes, they do not know how to answer my questions (i.e. about certain products / goods, etc.) probably due to lack of product knowledge. In other occasions, some good store clerks can answer and provide useful advice to me.
As for after-sales services, I would say they are available Dili, but I cannot comment about in the districts outside of the capital city.