Urgent

I have a contract phone with Vodacom it's been many years now. From this I experience that the overcharged me when the debt month end.i upgraded in July and my p30 2020 was R269 per month's, but I can tell you they deduct R434 every moths and I tried to call them time and again. I cancelled the insurance long time ago oof R98 but they still deduct. I took second line in November for R329 which is my bill should be R578 for 2 phones but now I see they are going to bill R724, there is another R112 for insurance of which I did take the insurance. Please if is there any help because I tried many times to contact vodacom