Vodacom overcharging greed: Caught red-handed

Vodacom has been overcharging me for years. I eventually decided to move to a fixed top up contract to allow me greater control over Vodacom's greed, starting from Nov 2018. The contract is approximately R369, my second contract is R202. The total monthly amount should be R571. Vodacom has instead charged me over R900. Having had my phone ****** I went into one of their stores to do a sim swop. They have informed me that this cannot be done because of the 'arrears' amount. Be very careful and pay attention to your vodacom invoice detail or better yet move your cell phone account from them as they are so greedy that they will not listen to reason and facts. Let's not allow this company to ***** from South Africans.