Huge Account, attempted debit but no investigation

In July 2015, I incurred a +_R2600 bill on my data/ router SIM card that I initially thought was my error on my cell phone as the bill is deducted as a combined amount (I was in the UK and thought I had accidentally opted for roaming fees therefore I settled the bill). My router was turned off and in my drawer in SA while I was in the UK. <br> On the 2 Oct 2015, I received an sms warning that my data bill was sitting at R5000 odd after TWO DAYS. I immediately called vodacom+we lodged a request for an investigation as well as put a limit on my data (which I had not needed until now). It was then that I noticed my questionable July bill! Vodacom then contacted me on the SIM card that was inside the router (again turned off so as to not incur further costs!) which is not a phone, with pathetic excuses. I called again on 30 Oct to complain when Vodacom attempted to debit my combined cell (R259) and data (R259+R5000 odd!!). I lodged that they should contact me on my cell number. Instead, I was blocked the very next day! No service, no personal phone call (only MULTIPLE automated payment request calls over the past few days!) and a massive bill that I refuse to pay without investigation!