Vodacom Contract phone blacklisted due to dispute

I took a contract with Vodacome last year 14 September 2017 for a handset which is the J7 Prime I was paying my monthly installments according until February there after had problems I then was advised to make a pay for 2 months which in total was r1000. My monthly installments were R280 they said due the debit been rejected it's charges came in total of R1000. Okay that was R1000 then next thing my account is sitting on R2000 when asked as to how did it acculate to this amount they said it was it was because they gave me Data and I owed then, my contract was a top up contract. I then asked them to send me my statement up to date no one has sent me an email regarding my complaint. Vodacom has contacted me more than once and every time I request for a statement I don't get one till date they have not sent the statement as to how it came about to R2000. Currently Vodacom has Blacklisted the handset on the network nd I cannot use the handset. They have decided this with no correspondence with me even the last call they took my email address but still have not sent it through. I am very angry nd disappointed at the service that is given .

IMEI no: ********** ********** 1 Contract no: ********** 369