tablet still not working

if only samsung lived by their value, of excellence, customer service or even integrity i would still be buying their product. i though their contact centres was worse until i had to deal with their head office. firstly i logged a query that they still have my tablet after months of no communication from them whatsoever besides their sms of\ we are looking into your complain and we will contact you back. as if that was not enough they send a driver to bring back my tablet with the sim card removed but the f*** tablet is now saying no SIM and when i call i am told to reset factory setting even after that it does not work