Airtel — improper service activation and billing for that!

I traveled to united kingdom on 9th of september. And on that day i had a discussion with airtel customer support and got my bill plan changed to 149 roaming pack also as advised by your team i had deactivated my voicemail service. (Screenshot_1 in attachments). Received confirmation from airtel on the same day for voicemail deactivation. (Screenshot_1_1 in attachments).

And for your reference the next 2 months of my billing was perfectly fine according to the plan i was on and there was no voicemail charges applied. (Screenshot_2 in attachments).

After 2 months being here, all of sudden on october 30th i receive a message from airtel that my voicemail service is active and my charges are 720 and on 2nd november it was 1080. I have been calling your team from that day. (Screenshot_3_1 in attachments). I even tried deactivating it from my phone again but it said there is no voicemail service active (Last message in screenshot_1_1).

And as per conversation with airtel customer executive, he said you cannot activate/deactivate voicemail service from your handset when you are not in home country/network. So question is how did the service got active on 30th october as airtel executive itself said it cannot be done from the phone when number is not in home country.

Further i kept getting messages for these and your team kept saying we cant see the bill you need to contact us after you bill is generated (Screenshot_3_2, screenshot_3_3, screenshot_3_4 in attachments).

This has been pushed for a month now, and as they have got the bill now get this sorted!!