Pathetic Service Provider you can't trust

I signed up a contract with Vodacom for R199pm and a month later they increased my installment by R20. My relative also signed up at the same time and he had the same issue. She complained about it and Vodacom credited her account for the full 24 months, I then did the same and even sent the proof of her credit and they refused to credit me. This is how Vodacom treats their customers, con you with the price and dont treat all customers equally. Pathetic company