Bharti Airtel (Broadband) — airtel frequent disconnection and slow internet

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I have been complaining from previous month about the frequent disconnection and slow internet issues to airtel. Every time they promise to resolve the issues, but still it remains the same. Technician fools around and always lie and never turn up unless you call airtel hundred times.
I am really unhappy and would not recommend anyone to opt for airtel broadband internet. Please look into this matter.