Air India Express — Was not allocated the seat which i paid for in advance

Greetings! I'm constrained to bring the following to your attention I flew IX211 Sun 27th Sep PNQ-DXB. If you look at the attached E-ticket it clearly shows that I've booked seat no. 15A and this is a paid seat. Please refer to the attached boarding pass. Your counter staff issued a boarding pass for me with seat no. 16E. Unfortunately for me I noticed this once I passed immigration. This was because the airport was pretty chaotic at that time. I brought this to the attention of the airport checking staff and they informed me that they could not let me go back to the counter staff as I had finished my immigration formalities. The officer informed me that it would be best to contact the AI staff at the boarding gate. When I went up to the 1st floor I informed one of your staff who promised to assist me by releasing that seat 15A and that the supervisor onboard would see to it that I get my seat. This was the 1st lie. I was asked to wait and was boarded almost towards the end wherein the same staff again reassured me that the senior onboard would help me. Don't worry was what he assured me. At the gate of the aircraft I enquired who was the supervisor and was directed to him. He informed me to wait and that he would sort it out. I waited till all the passengers boarded. I was the last. He then shook his head saying that he can only request the passenger occupying 15A to move and cannot force. That was downright stupid to expect someone who has been allocated a seat with extra legroom to Voluntarily move. I informed him to insist that the passenger be asked to move as I paid for the seat and he shook his head saying that now nothing could be done. So that means another AI officer lied to me about being able to resolve the issue. I was sandwiched between 2 men and being claustrophobic I had a terrible flight. To add to that the hand baggage that I had and which weighed 2 kilos only could not be accommodated in the overhead lockers as they were all full and was directed to the cargo. Mind you this bag was not locked and it had my reading material in it. So I was in a little over 3 hours flight sandwiched between 2 men with nothing to read and just staring at the back of the seat in front of me! So do you think I had fun? I need a full investigation about how come a seat which I paid for is allocated to someone else when it should have blocked? Secondly why did your staff lie? Clearly I was fooled and lied to by 2 of your staff who need to be brought to task. And most importantly the staff who issued my boarding pass should be pulled up for his negligence. CLAIM NO. 1 - And now I demand a FULL REFUND of the airfare paid. CLAIM NO. 2 - My checked in luggage bag had a limited edition Emirate leather bag tag. When it reached Dubai, the bag tag was missing. Clearly someone nasty took a fancy to it and removed it from the bag. The tag could not have dislodged as it had a strap similar to a watch leather strap. Again I demand that this tag be returned to me. You can reach me on my email [protected]@aramex.com at any time. Looking forward to your quick response and equally prompt refund of the airfare