Company Not Acknowledging/accepting Resignation

My current company has a notice period of 45 days.
Due to personal reasons I have to shift to my hometown immediately and hence I submitted my resignation.
I have an offer for joining another small company in my hometown that i am relocating to.
However my current company is neither acknowledging the resignation nor accepting it in email. I am afraid they may proceed further and try to withhold the relieving letter and experience certificate. This would cause me to lose the offer that I have in my hometown.
But I have to move to my town at any cost.
What should I do? Should I approach the labour court now itself?

In career, nothing is immediate. You need to serve the entire notice period before proceeding to a new job.
Send you resignation in email...and then from that date...complete the required notice period. If you do not receive any response within that time frame then you can leave.
For more details you can read the following article - Dynamics of Human Resource Management: Employee Separation – Notice Period

Hi,
First talk to current employer and explain them the situation.
If they do not listen tell them you will take legal actions.
Try to settle this out of court.
Also do one thing since they are not acknowledging the resignation letter, send your resignation letter by register with AD. In case you have to approach the court it will be a proof that you have given them notice.
For any clarification feel free to write or discuss.

Just send the Resignation letter by RPAD & serve the entire notice period in company, at the end of the period u r automatically considered as relieved. And if company not providing dues & certificates legal course is the option.