Vodacom ********s

I am sick and tired of Vodacom . They are pathetic . I took out a contract for R1400pm I explained to them this is my budget , they agreed and signed me up , THEN started charging R1850 -1950 .I called and queried this they finally fixed it ,that was 2 month ago , last month they charged me R1820 ,NOW they've done it again.They are ****** ********s .How dare you take more money than youre suppose to? I have sent over 50 emails ( no I am not exaggerating ) They havnt rep**** to ONE . Ive tried calling them but ,you know , high volumes ( BS ) and when you FINALLY get hold of one, you get some guy called Banzi that asks you stupid questions NOT pertaining to the issue . I am fed up with this company , wont be using them again