I was a callcenter 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 internet,phone and cable. I have also enough knowledge about cold calling because I've 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 to what you are looking for.