Notice period serving

I have resigned from the firm stating poor mental & Physical health. However, company is asking me to serve 30 days with work. Also, I have done overtime for more than a year. I don't want to work and am not in a good mental state to work. Company has forced me to work. Please help. Below is the clause in Offer letter. In case of voluntary resignation from this employment, employees are required to serve as the case may be “7 days” prior written notice during the probationary period and “30 days” prior written notice after confirmation of employment. I-PAC reserves to recover salary in lieu of notice period or to accept any compensation in lieu of the same. Further, I-PAC may at its discretion relieve you from such date as it may deem fit during the notice period. However, if the management requires the employee to continue the employment during the notice period, the employee shall be obliged to do so. You are not entitled to deliberately avail leaves (Privilege or Casual) during the notice period to shorten the notice period. Accumulated Privilege Leave/Casual Leaves or Sick Leave will not be encashed during service or at the time of retirement or resignation.