Team Leader Yasseera Yasseera and Manager Dingase Lungu is just ignoring my mails

I am receiving no feedback from Standard bank Credit Life, the Team Leader Yasseera Yasseera and Manager Dingase Lungu is just ignoring my mails and when I phone the only answer I get is to send a mail to Yasseera. I've even sent mails to the call center asking for them to stop deducting with all the necessary documentation because we have cheaper insurance with Momentum but they just ignore all . Originally the auto mail confirmed that we would receive feedback in 5 working days but it has been a entire month and still no feedback. Can Standard bank really be this pathetic with their services or are they doing it on purpose because they know that THEY ARE LOSING MONEY . What more as a Client can I do. THIS IS THE WORST EVER. HOW BLANTLY THEY JUST IGNORE ME!