Spec-Savers Northgate messed up my lenses and now refuse to assist

6 months ago I bought a set of glasses from Specsavers. When I tested the glasses I told them it felt too strong and they said my eyes will adjust. Explained that I work on a cruise ship in the US and I leave in a day and I need it to be perfect. My eyes never "adjusted". Glasses worked like a magnifying glass that I can't use on a computer which is my job onboard. Its way too strong so it was total waste of my time, effort and money. I just got back for a vacation after 6 months as I told them before and without them hearing me out or even remembering me, speaking to 2 people, the experience just got worse. I kept on getting story that 6 months is a long, hinting that I took 6 months to come back and when I knew it wasn't right. I had to repeat myself and explain to them that I live and work on a ship and just returned. I get told they are sure I must have come back inbetween the 6 months and could have brought it in. I was becoming really annoyed and then tried to explain the mistake is on their end as I just did my ship medicals and it was proven the right lens is so bad, I can read the small numbers better without the glasses and I was told by the Dr that SpecSavers messed up. So I was simply turned away saying the can't help me, I should have emailed and complained.They knew I wasn't happy, they didn't care. I knew I was returning in 6 months. The email reply would have been exactly what I tried to do today, which is to physically bring it in when I am physically in the country. I would think that makes some sense, unless Northgate Spec-Savers would have flown the faulty glasses from the US and then guessed where they messed up my glasses and caused me 6 months of suffering without glasses I paid for and told the optomerist about it before leaving the country. And besides the salesman who was the nicest guy when making sale, now didn't recognize me, no problem, but to be arrogant to me and my elderly mother is just disgusting.