How do I stop my router DNS from being changed?

Hi all,
I did a search on this but none of the discussions really matched my problem.
Anyway, a few weeks ago I had problems with an Android device that refused to take app updates. I rebuilt the thing several times to no effect. At that point I gave up, and tried to google the problem to see if anyone could help. Then I discovered that I couldn't connect to google.
It turned out that some evildoer has somehow managed to change the DNS in the DHCP section of my router (or Mac Network settings?).
I quickly logged into my router (which already had a custom password), and changed the DNS servers back to the Google public ones.
I also changed the router admin password to a new, longer one.
Today I discovered that the DNS has been changed back again to 162.248.99.162 which is presumably the bad guys' server.
I thought I'd dealt with this by resetting and changing back to Google and choosing a new password.
So now I'm wondering if there's something on the Mac that is allowing some third party to change my DNS settings. I have ClamXAV but that's the only security software I use. I don't know how to find out if there is some DNS changing malware on my Mac, or to what extent my security has been compromised. Any ideas?
Thanks in advance.

Thanks MadMacs.
You need to make sure that you have disabled the ability to reconfigure your router from the WAN (Internet) side.
I am not sure how I do that. Where might I find that setting and what would it be called, typically?
Also check to see if your router is one of many that require new firmware to overcome known vulnerabilities that allow WAN access without a password.
My router is some ancient Huawei jobby that my old ISP gave me. I tried searching for firmware updates but the model number is not even listed, which is either because it's so old it's no longer supported or because it was a model only supplied to ISPs for their customers. Maybe I just need to get fibre broadband and a new router.

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How do I stop my router DNS from being changed?

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