Cell C poor service

Good day <br> If somebody could kindly assist me with my query, over the past 3 months I have spoken to several call centre agents at cell c explaining the same problem time and time again but none of which was able to help me, I have been overcharged for the past 3 months and each agent has a different story, my query has been escalated more than 20 times already with no feedback from cell c, I find it so strange how they never forget to debit your account every month but fail to make a simple call to their customers, In Jan I was charged the service for the month of Jan and then in Feb I was pro-rata for the 2nd -31st Jan because my upgrade was only done on the 2nd of Jan but the agents keep telling me I should have not been charged for Jan which doesn't really help me because each mount my bill goes higher and higher, eagerly awaiting a response <br>