Poor customer service and service delivery

I bought some equipment new which failed during warranty period. 1. was sent in for repair and returned 2 months later. it failed 2 weeks after reinstalling. 2 went back for repair ,which cost R2000 ( warranty had expired ) and was returned 3 months later. IT failerd immeadiately. It went back for repair ( i was told if it failed again ACDC would consider a credit) 4. unit was returned 2 months later and failed again after 2 weeks use. 5. unit was repaired again and the credit was requested. It was returned in august and installed in september, Ran for 1 day and started misperforming. ^. credit was denied as the employee who suggested the credit had left ACDC employ. Reason for denying credit: why was it left so long before credit was requested. The warranty period had expired a year ago. after the initial warranty repair I had a working unit for a total of six weeks . the rest of the time it had been either with ACDC or being delivered to or from ACDC.