VODACOM ARE *****S AND A HUGE DISAPPOINTMENT

This is the 2nd time that I am Complaining about Vodacom. I took out a dual contract for R659 pm with insurance total should be R890. Last month I got a bill for R1344.30 now for October I get a bill for R2814.18. I was told apparently this is an open contract, nobody told me this btw when I took the contract out. So now everytime my daughters boyfriend buys her data it gets added onto my account, which makes no sense te me. I even told my daughter to remove her sim card but still the amount increases. I haven't topped up since I got the bill of R1344, I'm to scared to. So where does this R2814 come from now. If this the case then VODACOM can have their phones back and cancel this contract I am not paying R2814 end of October. WTH is this trying to ****** money from you each and every month. I only paid R890 the 1st month. End of October will be my 3rd month, does this my total due is going to increase each and every month. From R659 to R2814 in 3 months I don't think so.