When I change the DNS of a dial-up coection, by the time I recoect it is reset

I have a dial-up coection with a provider whose DNS server is offline erratically. When I change my DNS using the usual method with the Network and Sharing Center to Google DNS, it asks me to recoect to apply the changes, but when I do so, everything is cleared. I have also used an app called DNS Jumper but that didn't work either.

I would appreciate it if anyone could help me solve this issue.

Thanks in advance.