Airtel — 4g upgradation

I went to airtel office ramnagar district nainital i. E green city galaxy for upgrading my 3g sim to 4g on 06 may 2018. Firstly there was no airtel employee in the office, only the merchant who has a shop of milk dairy was entertained me. He has given me a new sim and told me that it will activate in next two hours but today i. E on 08 may 2018 the sim hasn't activate yet and i went to airtel office so many times but couldn't get a satisfactory reply from anyone in the shop cum airtel office. This disgrace me and down the reputation of airtel in front of me. Still i didn't get any info about my sim.
Very bad show by airtel network

Thanks.