RCS/Blake & Associates/MDB Collections

I received an opening balance from RCS for 50K, after utilising 10K, i had 40K left, take note i had a debit order with them since the beginning. Internal ***** was committed whereby 40K was spend on goods in JHb while i was in Cape Town with my card still in my possession. I made contact with RCS telephonically where it was explained that someone altered my profile and changed the last 4 digits of my celphone number so when there is irregular purchases made then the ***** department cant get a hold of me, i went to there offices and consulted with their ***** administrative department, where they immediately closed/froze my account, after that i opened up a case at the police station. Within a couple of days after doing my own investigation whereby evidence was gathered, i gave RCS the case number as well all the intel and evidence that i gathered, all this was attached to a email where i also asked them a bunch of questions. Up until today they have not responded but instead, 38K was paid back 2K short, sms sent to me stating that their investigation is completed and that i can pick up my new card at Game, so an extra 2K was implemented into my current instalment, i have now been harassed by RCS, Blake & Associates and this MDB Collection agency after i have send them all the chain letters, with them being wring, my concerns etc, Blake & Associates went quiet as i believe they saw where their client went wrong but this MDB collection agency is harassing me everyday knowing that their client is wrong as well sitting with all the evidence proving that their client messed up and they need to correct the instalment and reimburse me. What do i do????? Cause i am gatvol