Customer ServiceCornerstone Office Systems has been built on the commitment to provide excellent Customer Service. A good example of this is our 3 hour average turn around on our customer service calls. Of course the traditional method of picking of the phone and calling us at 1-877-321-9442 is still encouraged and for your convenience we have added different forms and options listed below. Thank you for your patronage, it is greatly appreciated and we look forward to serving you in the future for a long time to come! To order supplies for your Multi Function Printer please call 1-877-321-9442 or click here. To give us a scheduled meter read please call 1-877-321-9442 or click here. For a service call please call 1-877-321-9442 or click here. We are located at: Cornerstone Office Systems P - 269.321.9442 Download Sharp Drivers |