Don't understand simple English

Cell c really does not understand English. You guys' phone me 4 times each and every day to try and sell new deals. Every time I have to say I'm not interested. NOW I'm at the point where I will be cancelling everything, I have with cell C. Not interested in your things and harassment anymore. When I drop the call because I'm busy and giving training you guys keep phoning. Dropping call 4 times means I'm busy or unavailable but you don't get the picture. I was thinking of upgrading my contract when it expires but after the call, I just had now YOU convinced me not to. You also do not understand when I ask not to phone me or to remove my name and number from the call list. You just ignore me and phone numerous times daily.