Will I need to pay for not serving Notice Period

Even, I was on probation period

You need to see your appointment letter. If it contains a clause that you have to give legal notice or one months' salary in lieu thereof, then you are supposed to comply with it.

It is unclear whether you served for one month after sending the resignation. What do u mean by Bench. clarify.

and dont worry, generally we advice our clients not to take action until teh amount is very high.

How you got the information  from HR dept  that, you can collect your relieving letter.  It is important doc. Next  generally  if an employee  walks away  within probation period, there are no binding  rules.  Still it  is  matter of  terms and consitions of your employment letter.

If I am not wrong  your  word  BENCH  wrongly   typed  instead of  BED.  ( refer  last word of   first para).

You  can write a  simple  and normal letter  stating  that   you have joind  on ....  and  as per employment  letter the probation period is .........  months  and  in case  of separation  ..........  within  probation period no notice period  is to be served or  equal pay.  (  refer your  employment letter).   and request them to withdraw their letter and also request  him in your letter  not to take any legal actions  as  you cannot afford  the litigation and   you  did not any  wrong against the company.