Services charged

I received notification that I had exceeded my data bundle of 500Mb which was supposed to be soft locked after the bundle was exceeded by R 3500.00. My average spent is R 1600.00 per month. After further investigation I was informed that I had supposedly solicited products/services from a vendor in the UK. I was given a contact number in the UK and they confirmed not having my mobile number registered on their systems, nor did they provide the content/services I was billed for. The total amount of R 2800.00 were charged over 35 different transactions, which now they are claiming were for Nokia games which I also have never registered, nor bought from. I am demanding a refund, but no response from Vodacom thus far.