Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Horrific customer service

I actually have now had 3 Sandisk products, all of which have malfunctioned and ceased working. The customer service in trying to resolve this is abismal. The return process is cumbersome and takes forever. I was promised return phone calls from supervisors which never came. One tech on the phone actually had the nerve to tell me just wait for the supervisor to call. I think that there are somer real technical issues with these products, and I would greatly caution anyone considering dealing with this company to consider some of the other well established products out there. My experience has been horrible.