dns issues are not usually specific to one location or geography or municipality. You need to be more specific in describing the problem you are having, and your suspicions as to what could be the cause.
in your original posting you suggest: "please check it out and fix this issue". I just want to prevent any possible misunderstandings. We too are Rogers customers, pretty much like you. We are not Rogers, and cannot "fix this issue", much as we would like to.
You mention "dns service issues causing slow internet and at times no connection". dns issues can cause some slowness in Internet connection, and also connection issues. A number of us have posted on problems we have seen with the Rogers dns servers.
Have you tried pointing your equipment at other dns servers, for example Google at 220.127.116.11 and 18.104.22.168 (or any other dns servers out there) to determine if that will change your problem?
At this point we still don't know anything about what type of Internet connection you have, what equipment you are using, or what actually led you to conclude that you had dns issues. Please help us here and tell us about what's been happening with you.