Airtel — 2g to 4g sim upgrade

Address:Dehradun, Uttarakhand, 492015

I don't know how many times i have got calls and messages saying upgrade your old sim to new 4g sim to get better network experience, so i went to airtel store and asked them to do so.
They messaged some 20 digits no. To 121and asked me to wait for a confirmation call which never came. I went again and again to airtel store but it never got upgrade, it shows that "your previous sim change request is in under process please wait for a call. And its been like 3-4 months but i always get notifications for sim upgrade.
Please help me out of this.
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From the last 3 months i am complaining about the internet speed which too fluctuates or some time it does not work totally...and when we complaint they reject call every time ...so i think iy will be mine last recharge..

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