Ping spikes in airtel

I recently purchased a airtel connection 2mbps till 30gb , 512kbps after that.
My issue is only the unstable ping , so gaming is a pain.

I am using the Beetel modem 450TC3 which they provided me with

my snr values :
SNR Margin Down Stream - 29.3
SNR Margin Up Stream - 25.0
Up Output Power - 8
Down Output Power - 11.5

I pinged my router : (no fault here)
Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time<1ms TTL=30
Reply from 192.168.1.1: bytes=32 time=1ms TTL=30
Reply from 192.168.1.1: bytes=32 time=1ms TTL=30
Reply from 192.168.1.1: bytes=32 time=1ms TTL=30

Trace results for google when ping is unstable

Tracing route to www.google.com [74.125.68.106]
over a maximum of 30 hops:

1 1 ms 1 ms 1 ms 192.168.1.1
2 576 ms 636 ms 667 ms abts-north-static-136.237.160.122.airtelbroadband.in[122.160.237.136]
3 685 ms 709 ms 853 ms abts-north-static-210.237.160.122.airtelbroadband.in [122.160.237.210]
4 775 ms 846 ms 837 ms aes-static-021.78.22.125.airtel.in[125.22.78.21]
5 824 ms 582 ms 361 ms 182.79.220.206
6 361 ms 198 ms 107 ms 72.14.242.178
7 471 ms 563 ms 690 ms 72.14.232.110
8 408 ms 419 ms 388 ms 72.14.235.29
9 169 ms 172 ms 235 ms 209.85.244.25
10 * * * Request timed out.
11 473 ms 445 ms 385 ms 74.125.68.106

Here is the traceroute of when the ping is somewhat stable

Tracing route to www.google.com [74.125.236.48]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms 192.168.1.1
2 24 ms 27 ms 25 ms abts-north-static-136.237.160.122.airtelbroadband.in [122.160.237.136]
3 26 ms 27 ms 26 ms abts-north-static-225.237.160.122.airtelbroadband.in[122.160.237.225]
4 28 ms 27 ms 27 ms abts-north-static-217.237.160.122.airtelbroadband.in [122.160.237.217]
5 27 ms 47 ms 38 ms aes-static-021.78.22.125.airtel.in[125.22.78.21]
6 120 ms 153 ms 106 ms 182.79.236.122
7 87 ms 87 ms 92 ms 72.14.242.178
8 109 ms 87 ms 89 ms 72.14.233.204
9 131 ms 98 ms 93 ms 209.85.241.33
10 87 ms 104 ms 110 ms maa03s04-in-f16.1e100.net [74.125.236.48]

There are no virus in my pc and i tried running the ping the tests above in safe mode with networking
I already complained by they said you need static ip for stable pings

Does anyone have any advice ?
Edit : did a adsl test in the router https://i.imgur.com/1udgf2m.png

the trace route is same in both the cases. only difference is ping to the gateway which obviously means the gateway server is overloaded.

So , if i ask them to change my gateway , that will fix it ?