Hi, welcome to mobileread.
Sorry to hear about your problems with the Sony. I also have this device and no issues. I guess I would ask now either for a complete replacement machine ( ie not wait again for a repair job) or my money back.
If you are not put off from e-Reading all together, maybe you'd like to check out The which one should I buy forum:
https://www.mobileread.com/forums/forumdisplay.php?f=123