Locked into a contract for old equipment

Dear Xerox - i unfortunately have a contract with you for your photocpying machines that continues to break - i have had technicians in my office - which is very disruptive - sometimes 3 times day. You have refused to replace this 1 particular printer as you believe there is nothing wrong with it - yet it makes screaming noises while i try to print - constantly jams the paper . Please note that even though i have to continue paying you for the next 6 months until my contract expires , please come and collect the printer and keep it . I will obviously be sending all the other 12 printers we have on contract with you - back when they expire - which is between 4 and 6 months !!! Bad bad business decision and bad bad service has lead you to loose all my business