Ask your surgeon for a copy of your operative report. Every surgeon is suppose to dictate a report following surgery that explains exactly what was done in the procedure.
Breast implants 650cc, 1 day post op. No pain, tightness, not sitting high, supposed to be under muscle? I don't think they are?
Congratulation on having undergone the breast augmentation procedure. Assuming you have chosen your plastic surgeon carefully, I am not sure why you (or any patient would think that your plastic surgeon has "lied"). Remember that every patient will have a different experience; it sounds like you are doing relatively well. A relatively pain-free recovery does not necessarily mean that the breast were placed in the sub muscular position.
Verify with your plastic surgeon for accurate information. Best wishes for an outcome that you will be very pleased with.