Jenga charges to account

On 1st Sep the sms from my bank showed the MTN debit order was R2359.30 more than normal. On checking the invoice online I saw that on 10/08/15 two charges were made by JENGA (no idea who or what they are). One was for R1017.82 & the other for R1051.75 these plus the VAT come to R2359.30. I called MTN customer care straight away and was told that she could see that I would never use that amount of data in a lifetime & she was submitting a request for the charges to be reversed. When I heard nothing I emailed the so called customer care email address but never received any feed-back or explanation despite numerous emails. I was eventually told that I had not passed their security check despite giving my ID, email, address, bank and type of account. I have been a client of MTN for 15 years and none of these details have changed. But apparently \JENGA"does have access to charge my account **********ly. I called last night and was told that the reversal had been approved & the refund would be in my account in the next couple of days. I called 808 this morning and was told that I would not be refunded as they had a promotion and I had accepted it. I have grave concerns re this *****."""