Just my two cents here so take it for what its worth....most if not all Tasco scopes have a lifetime warranty...yeah ya might burn a buck or two shipping it back, then again you might end up with something that works just fine for what you will be using it for!!!
I have had tasco scopes on many of my rifles as well as Bushnell's the best shooting rifle I have which is a Sako Finnbear in .300 H&H had a Bushnell on it since 1965....I never had a problem with what many consider an inferior scope, it never lost it's zero the only reason I finally did replace it was because the glass in it was just not the best for low light shooting as most scopes of that vintage were so handicapped!! send it back see what can be done you might be pleasantly surprised................