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

I have a dial-up connection 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 reconnect 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.

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