how do I deal with this as a consumer when... I go buy a router from target... bring it home. 4 months later there's a security upgrade which also changes the

how do I deal with this as a consumer when... I go buy a router from target... bring it home. 4 months later there's a security upgrade which also changes the DNS resolution behavior to give me ads. What's my recourse as a consumer in this case? return to target? return to dlink or whoever manufactured it?