Vodacom useless

I have had it with Vodacom. Every month I get my bill and every month I pay almost R200 extra. Then around the 7th of each month I get an automated call saying that in order to stay connected I need to pay in an extra amount. Never the same mind you. I’ve being to several stores to try and find out what it is I’m paying extra for but no one seems to be able to tell me. This month I got the call and I payed the amount the same day. However I’ve being getting the same call for the last 5days. ***.