Very poor service

I visited Margate Eyecare in Hibiscus Mall two weeks ago, I walked in and was assisted. I wanted to order contact lenses with my own prescription which I tested my eyes with in July 2017 I was given a form to complete with my details. I handed it back and I was told all is fine they will order my lenses for me. I collected my lenses on Thursday I paid the full amount that was due and was on my way. I opened my lenses on Friday morning I then realised that my vision is not correct with the lenses. I then checked my prescription that I had given to them compared it to the prescription on the contact lens boxes I then realised that it is not the same I then contacted Margate Eyecare right after I was advised that my prescription was changed by the Secretary, and that she changed my script without consulting with me. I asked as to why did they not contact me before ordering the lenses that they claim is incorrect only to be told as I am a walk in customer and not a customer to them they do not call walk in customers, and proceeded to change my script. I was then told that it shouldn't make any difference, but infact it did make a difference as I explained to them. I was then advised to go in only to be blamed that I as the customer made a mistake and they had to change it, after going back and forth the Secretary apologised that she made a mistake, but still blaming me for it and stating that I gave the incorrect prescription and even that I am possibly wearing the wrong lens ( which I have been using for years now) this was just another excuse for their mistake but continued to blame me I was then told that I will be called on Monday by the Optometrist for further information. So here I am today received a call from the Secretary only to be told my eyes have to be tested by them and that I now have to pay additional monies for this, with no guarantee that I will receive credit for my incorrect lenses that they ordered, what kind of customer service is this, they change my script and blame the customer for their mistake, and best of all the Secretary will tell me I'm being a bit difficult what did you expect I order contact lenses and you change my script without even informing me. I cannot use these lenses. This is truly pathetic service, I would not recommend for anyone to visit this facility, upon every visited there was a customer complaining and unsatisfied this should have been a warning for me not to use them, nevertheless I know now that I would never trust them to provide any kind of proper service to me.