UnicodeDecodeError:

[snippsat]

That's fine if can go into file and fix it.
Here some way to get around problems.

>>> s = b'2018-03-26,HQ Service Center,Handset,Samsung Galaxy S9+ and Charger \xffBlack,1,Sales\r\n'
>>> s.decode('utf-8')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 68: invalid start byte
'utf-8' codec can't decode byte 0xff in position 68: invalid start byte

>>> # Try other codec
>>> s.decode('latin-1')
'2018-03-26,HQ Service Center,Handset,Samsung Galaxy S9+ and Charger ÿBlack,1,Sales\r\n'

>>> # Just ignore error
>>> s.decode('utf-8', errors='ignore')
'2018-03-26,HQ Service Center,Handset,Samsung Galaxy S9+ and Charger Black,1,Sales\r\n'

>>> # Replace with fill in(?) where error is
>>> s.decode('utf-8', errors='replace')
'2018-03-26,HQ Service Center,Handset,Samsung Galaxy S9+ and Charger �Black,1,Sales\r\n'