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Airtel — upgradation to 4g sim

I had requested for upgradation of my airtel prepaid no. [protected] on 13.10.2017 to 4g. I have a new sim bearing[protected]. As i entered the number and sent it to 121, i got an immediate acknowledgement that my new sim will be activated soon and the old one will continue till my new sim is activated. Its been more than a week and my sim has not been upgraded. Moreover i am not getting any assistance from your end.
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