Too Costly

I bought a SONY xpriaV at SONY CENTRE, JURONG POINT, Singapore for $589 on Friday night 9’O clock. For this price, the sales man gave build up that the price is $689 but, now they are giving offer price. I also trusted them and bought a phone. The next morning I went to IMM Singapore with my friend for purchase some thing. On the way I saw SONY STORE at IMM. We entered and just asked them that What is the Price of SONY Xperia V. He told $528 sir. I shocked. Because that lost night I paid $70 more for same phone. Straight away I came back to SONY CENTRE JURONG POINT and I asked them “why this difference”. They replied, “Sir, that is SONY STORE, this is SONY CENTER”. They told the $70 difference is for the WORD- CENTRE and STORE. Any can accept this reason?