Internet gets very frequently disconnected

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I have 40 mbps plan for 6 months, but I am getting only 4-5 mbps speed which is also with frequent disconnection, they took amount in advance and at the time of service, they only say our backend team is working, I have raised a complaint more than 50 times, but still no resolution to issue, I haven't seen this much worst service in any other fields, I am really frustrated with the service, I recommend no one to go for Tikona, because the service is really disgusting.