Usual Qs: "Tell me about your experience in customer service." "Why are you interested in working for our company?" "What are your salary expectations?" "What are your strengths and weaknesses in a customer service role?" "Describe a time you handled a difficult customer situation." "What do you know about our products/services?" "Are you legally able to work in Spain?" "What is your level of spoken and written English and Spanish?"

They obviously want to make sure that you fit with the position you will applied for, so they will ask you about your previous experience, how you dealt with different situations, why do you like this specific position. It is also very important to be a cultural fit for the company: the way you are as a person and professional needs to match the company values.