Good day

I would just like to enquire regarding a fixed term contract.
The employee in question was on a fixed term contract for 6 months ending 31 October.
We did inform him that we are planning to rol the contract over for another 4 months.
However we have not given him anything in writing.
I read somewhere that if you don’t give the employee an new contract in writing by the time the old one expires and he works further, then he automatically becomes a permanent employee.
Is this true?
If it is then this employee is probably a permanent employee now?