POOR SERVICE ACCOMPANIED BY BAD ATTITUDE

Could I please be reminded why I pay MTN monthly and still have to take the bad service and attitude the agents render?I called the contact call centre stating that my contract airtime of R210 and my buddle finished just by updating the update centre on my Sony experia , the agent gave me such attitude and told me she will put me through to someone who will be able to assist me, I waited 30mins just for someone to take my call and the person was not helpful telling me my last update costs R119, for me she was speaking a lot of jargon and not explaining why 1update can take all my airtime and buddle's . At this present moment I have had enough of MTN and airtimes and bundles that just seem to disappear as this is not my first incident , its more like ever since MTN was on strike the service got poorer , its either you ship in and rendered good services or we ship out, I need someone to respond and give me a detailed explanation of why my buddle's and airtime keep going missing or I will take my money somewhere appreciated ..this is unacceptable R210 is a lot of money to just disappear in 2hours of it being loaded.