Matrix - Faulty Computer still NOT resolved

I purchase a new P.C. in July. Since a then I have had a continuous problem with the P.C. freezing at odd times, sometimes twice a day some times not at all, never knowing when I am continuously losing work, time and patience. I have been backwards and forwards to Matrix Blueberry on a weekly basis , with technician after tehnician trying to route out the problem with no success. 3 months down the line I am still without a properly working computer. The first complaint to head office no responce just a call from Blueberry and back there-yet again- the second time of complaing to head office-no responce. I certainly would not recommend Matrix for a new computer.