I was a call centre agent for almost 3 yrs. My job was all about answering phone calls with regards to internet connection issues. Aside from that, I am exposed to sales wherein we market our product which is the internet, phone and cable. I also have enough knowledge about cold calling because I've been a telemarketer for b2b and real estate investor cold caller. That experience alone has shaped me to become flexible and knowledgeable in marketing which includes troubleshooting too. And that I think best suits what you are looking for.