Provide a clear example of a similar job you have done in the past.
Hi, I've been working at a call center at billing and retention area, my job there was to keep customers happy and to help them on get the best of their tv and internet packages, sometimes I used to call to close some sales and to continue make them happy, on this job, I was the best until I quit
Proposal:
I always try my best, doesnt matter the job I am making