Extreme bad customer service

RCS I have Makro account and used it last year April and May 2015 I made full payment of the account and send proof of payments but till today I am getting statement after statement, emailed/ called accounts department from last year more than 20 times no one is able to address this , different people all failed yet they record all the communication . RCS staff are incomplete and I have paid more than I am supposed to pay but no difference. I am tied of wasting my time money to contact them because it's useless.RCS Management please address this from May 2015 to to date. 9 months now still this simple thing can't be sorted out I not planning to ever used RCS services it so terrible bad.