Disgusting service

On th 1st of February 2019 I requested cell c via email as per their process to change my payment method from debit order to cash as it decreases my chance of going into arreas. No one has ever got back to me regarding my request till today. I have followed up twice with their useless call centre twice and I got no assistance. On the 05/02/2019 I spoke to Lungelo Innocentia Khaya and I demanded that she asks her team leader to do something about my situation and the Team leader (Alga Afrika ) promised to follow and update me as soon as he or she gets feedback. On the 07/02/2018 I followed up again (Ref: 19 ********** 002622) and I spoke to Xabiso Ndam Ndam and her team leader Kwanele Khumalo who were also very useless, they refused to follow up on my behalf and to request a recording for me. I have been also waiting for cell c to combine all my lines since last month. What more should I do now for cell c to process my requests without me having to complain first?!!