Vodacom keeps overcharging my account with no notifications

<p>Although I have a R100 voluntary call limit on my R500 cellphone contract, for 2 numbers, instead of my bill being R1200 it has been R2200 for the past 4 months. I have phoned Vodaom about 30 times over the past 4 months to ssort this out. No one can explain this or why I am not receiving any warning messages, which Vodacom are supposed to do. I have spent hours and hours on the phone, people have supposedly logged queries and they are supposed to be resolved within 24-48 hours. I have been waiting 5 weeks for the one and 5 days for the other. No one is prepared to help me. I just get passed fropm call centre employee to call centre employee and no one will put me through to a manger . It has been 4 months, hours and hours of phone calls and still no one from Vodacom has ever contacted me to resolve it they just keep over charging my account by double the amount.</p>