Leave without serving notice period

Dear Sir Please help me i have very thankful to you. I have left from my company without serving notice period of 1 month within probation period of 3 month my joining is 12th August 2019 and left on 11th November 2019. Also company issue me the Offer letter with mentioned that "there are probation period of 3 month" and not issue me the Appointment Letter. On 28th November 2019 company issue me the Legal Demand Notice that you have to pay the one month salary to company. So please guide me that what i reply of Notice. I have signed employee hand book which is on plain paper or not on company letter head. Please see the Point of signed employee hand book:- (1.4 Resignation / Termination of services Unless otherwise stated in the Employee’s employment agreement, either party may terminate the Employee’s employment by giving one (1) months’ notice in writing or by paying salary in lieu of notice. In the event of receipt of notice of termination / resignation from the Employee, the Company, if it so desires, can release the Employee from service immediately or at a shorter notice period than the prescribed period of one (1) month, without recovery of any salary in lieu of notice. The Employee’s employment may be terminated by the Company without any notice or payment in lieu of notice under the following circumstances: a) if the Employee is guilty of any default or misconduct in connection with or affecting the business of the Company; b) in the event of any breach or non-observance by the Employee of the express or implied terms governing his employment including any directive issued by the Company from time to time; c) if the Employee becomes bankrupt or makes any composition or enters into any deed of arrangement with his creditors; d) if the Employee is convicted of any criminal offence (other than an offence under road traffic legislation in India or elsewhere for which a fine or non-custodial penalty is imposed); or e) if the Employee becomes of unsound mind. Bits N Bytes Soft Private Limited Employee Handbook Page 4 of 15 An Employee who is absent from work for more than 3 (three) consecutive days, without the prior approval of the Company shall be deemed to have terminated his contract unless he has reasonable excuse for such an absence, and has informed or attempted to inform the Company of such absence prior to or at the earliest opportunity during such absence. Upon termination of employment for any reason, the Employee shall forthwith deliver to the Company any and all documents and / or any other materials which relate in any way to the affairs or business of the Company or its related companies or their client(s). On 28th November 2019 company issue me the Legal Demand Notice that you have to pay the one month salary to company.