Termination without a show cause notice

I was appointed on 17th August 2015 and was working with the airline until I had a medical condition while on duty in April 2016 and was under treatment for disc bulge till October 2016. From 12 April I had been sending all the medical reports to the base manager and she had been acknowledging the same through email and phone. In the month of October they asked me to get a fresh mri scan done and I sent them my reports. I had improvement in my condition and I wanted to resume back to work. I consulted aiims doctor and submitted the fitness reports which stated fit to join duties but avoid lifting and bending and continue physiotheraphy exercises. After which I didn't get any call or mail from them, I was preparing myself for the training as I expected them to call me for training. I contacted my base manager and even the company doctor but they didn't respond to the email. I was tensed so I sent reminder to the base manager but no response. Because of the medical issue I had been hospitalized for two months and after discharged I was kept in hotel near the hospital for physiotheraphy as my place of residence was far and I could not afford to get any strain by long siting or climbing stairs. This whole episode itself left me depressed as I could see everything falling apart. This was the last I expected a termination and no response till date from any of the hr mangers. I called the office and was told to wait for 6months and apply as a fresh intake. I want to know is this fair, I have been a honest, hardworking and good crew. According to the termination sent through email : It has been reported that you were not contactable since December 01, 2016 and you have not reported to office since April 12, 2016 .We contacted you telephonically but you were not contactable. As per your Offer Letter Clause 16 (iii - h) which states that the company shall have right to summarily terminate the employment of the employee, with immediate effect and without any compensation, if in the opinion of the company, the employee remains absent for more than 3 consecutive days without leave from the company and without assigning satisfactory reasons. However, we had sent show cause notice to you to report to office to the address you had shared with us at the time of joining but the same has not been delivered to you. Therefore, ample time has been given to you to report back to office but you have failed to report to office. Accordingly, we regret to inform you that your services are hereby terminated with effect from December 01, 2016. please provide me some help as I am till date trying to contact them but no response. The person who sent the termination email had provided a number which was switched off everytime. I don't understand what was my mistake I was doing all my duties and I never had any spinal issues before joining. No correspondence from the airline hr. What should I do? I loved my job and I don't want to quit.