Customer not needed

I upgraded my modem. The store consultant said it was easy. Just delete old software, download new and everything will be fine. It does Not work that way. Now i cannot connect to mail and internet to do work. After 3 calls today the last consultant didnt care and when i said i am cancelling my contract. She said fine without hesitation and put me through cancellations. Just goes to show... we just a number. They don't need us or care about us!!!