Vodacom & Elite Mobile are useless

I, I have logged 3 or 4 (lost count) Hellopeter calls, spoken to Vodacom AND Elite mobile who were all going to look into my complaint & not one person has gotten back to me. This started 6 March when I upgraded because I was advised that my monthly premium would reduce. Was paying R598 - got a quote for R606.99, so I declined the upgrade 7or8 March (had 7 days to decline). End of March was debited R598. got my April invoice and it was for R1092 which I queried, was told they had cancelled the upgrade but I still got debited R1092.09 end of April. , and now I have received an invoice for R1202.93. When I asked why, was told they not sure but it could be because of the prorating of the upgrade. Now I am no math boff, but if you are reducing your monthly premium, surely the prorated amount should be less than the normal premium, NOT DOUBLED for the next 2 months. FOUR people were going to look into this and get back to me, they were going to pull the call (which I might add has no relevance anyway BECAUSE I DECLINED THE UPGRADE, and nearly THREE months later, NOTHING!!!! I have FIVE contracts with Vodacom, which I am going to port if I do not get an EXPLANATION IN WRITING TODAY!!!