I have been working in a company in Bangalore for the past 6 months as a trainee. As per the offer letter given to me, the training period is for 6 months, for which I was paid Rs. 7500, from which PF and ESI were deducted. Now that I have completed my training and asked the company for an increase in salary, the management is saying that there is another 6-month probationary period for me. This was not mentioned at any time before. Is it possible to deduct ESI and PF during the training period and continue this probationary period after the training period?