Maybe your tamoxifen was fake, it definitley shouldn't have got worse while you were on it. When you say you did "proper" pct what did you rtake?
It's always a good idea to have nolva on hand BEFORE you even start any cycle so you can start it at the first sign of gyno. Unfortunately once the lumps have formed it can be very hard to get rid of. At this stage I wouldn't take any chances, go to your doctor and make sure you get some genuine meds, if it doesn't clear up after that you may be looking at surgery if the gyno remains noticeable.