Overcharging on the monthly bill, rain internet service providers

HI AM NEVHUNGONI RABELANI.

I have the following difficulties with Rain mobile, rain internet services provider.

I have been overcharged since Last month, last last month they changed me R539. 46 instead of R479 for unlimited data as advertise. This month end of July they charged me R1129.01 instead of R730, R479 and R250 for the Sim card that I have added for my family,

I have tried to write a message on their online platform but unfortunately until today no response from them.

Kind regards.

Rabelani nevhungoni ***