is there any possibility that i can block ipv6 connection on my laptop?

It's the IPv6 address assigned by your ISP at your gateway. Not any local ip addresses.

but if i disable IPv6 in my laptop wont it bring any change to it?

It's the IPv6 address assigned by your ISP at your gateway. Not any local ip addresses.

okay will take some help from the ISP if possible

thanks for your effort anyways

You are welcome mate. Once you have your IPv4 only assiged, I can help you forwarding the port in your router and you can throw away that annoying VPN.

but i came to know that government has forced the ISP's in india to turn towards IPv6 thats why they are using IPv6, so without static IP i guess i cant fix this problem , if you have any idea to bypass this issue then feel free to help me

There is no way to bypass this. Simply get a static ip address which should cost like five bucks per month.

yep i was also trying to purchase static IP , but suddenly my port block issue got resolved by itself , can you check from your end what changes my ISP have done ?

I cannot see any changes from our end, you still have that IPv6 address.