Statement and how much is due

I have been Paying MBD Attorneys in respect of MTN Acc , I have been requesting a statement since last year July and I donno how much is due and till when , last time I received a statement it was December 2017 and the amount due was R11400 and I have been paying R500 as per agreement but not it’s 2019 and I haven’t received statement from them and I don’t know how much i’m left with to settle my account and I have been requesting for my statement but nothing has been sent but everything month they deducted my acc .