Contract terminated but pioneer debt solution has closed doors for and they are not assisting me with anything

Good day please assist me with the removal of my name from the pioneer debt solution as my contract was terminated of which now I'm responsible for paying my accounts.what I dont understand why have they listed my name on credit bureau whereas their no longer rendering their services to me I find it unfair for them to do so .I have sent numerous emails for them to resolve this but no response everytime.it feels like I have put a rope on my neck with this because now I'm suffering as I cannot apply for anything yet pioneer is not helping me currently with anything but they are holding my life by the thread Please assist me in this regard