Vodacom account on errears

I have an issue with Vodacom. Apparently they claim l owe them a huge amount of money. They even went out to transfer me to TSL Legal. l then requested statements, on the statement l received there are invoices that do not make sense to me. When l ask for clarity, my emails are not being attended too. When l call, nobody is able to answer. They send me to TSL Legal for answers, TSL Legal is sending me to Vodacom for answers. The TSL Legal is now threatening me to pay within 48hrs or serious actions will be taken against me. I then sent my bank statements which they were debiting on to show that the funds went through but l can see how they are incorporated in their statement. Kindly help!!!!!