I wouldnt read to far into it, get the $ back and that's that. As far as potential issues, it would depend on the car. Typically a larger oil filter can be installed without issue, most vehicles can actually utilize multiple sizes. In regards to the light, could have been the wrong amount of oil added; a car should run relatively fine for awhile being 2qts low, a quart too much however would, and should, throw the oil light. I wouldnt lose any sleep on it.