What is the program version you are using?
Actually there are two ways to import a CSV-file:
1) Using SQL-statement LOAD DATA INFILE
2) Using ODBC and the Microsoft text-ODBC-driver
A detailed description of what you do (screenshots etc.) would help.
If data are truncated that must be because the colums you are importing to are too short.
Maybe you can attach/paste
* the CREATE TABLE statement for the tbale you are importing to
* a sample CSV file. In principle the first 10 rows/lines of your existing file would probably be OK.
(create a support ticket if you want privacy)