Retrenchment compensation is applicable to you if you are a workman under the Industrial Disputes Act. In case of retrenchment, the company is to retrench the last person to be appointed first. Generally retrenchment compensation contains 15 days of salary for every completed year of service and from other benefits including gratuity if applicable in your case.
There is no legal provisions for "forced to resign". If you were forced to resign, it means your service was illegally terminated. Such action on behalf of the management is illegal and has nothing to do with retrenchment.
When the process of cessation of employment either in way of illegal termination or so called retrenchment is in question, the issue related to serving of notice period has no legal validity.
May be you should come with clear facts of the case as mentioned here under for further suggestion
1. Date of joining
2. Your nature of duty
3. Nature of company with strength
4. Last date of work.
5. How exactly your service came to an end?