You may have to contact them directly, to see if they have hardware options
available for the older MacBook Pro to their tech service, and if such upgrade
would even be done in the Store. The use of an independent AASP or Apple
authorized service provider, may be a more likely candidate for this operation.
If I had a four year old MacBook/Pro that is out of warranty needing upgrade,
I'd certainly check out the competition; some upgrades you may be able to
perform yourself by use of iFixit.com repair guides for MacBook/Pro, or look
into OWC macsales hardware upgrade parts pages, and at the bottom, they
have free videos of repair & replacement installations. Also, good support on
items you may consider; ask questions about stuff before you try a DIY... etc.
The RAM memory macsales.com recommends for the MacBook/Pro has been
tested and guaranteed to work in the computer model(s) you have, and they
are reputable, and offer other replacement and upgrade parts. You should be
able to do the work yourself; or have a good AASP (some will) install any part
you want. Some independent authorized services are better at this than others.
So the idea there, in your area, is to ask around because cost may vary and
some shops (incl Apple Store) may not stock parts for your model; or it may be
considered too old for the Apple Store to offer upgrade service. Though some
Apple Stores may send out such service orders, in certain areas, if too old for
in-house, or other reasons. As a fellow Apple user in a different region than
you, I could not state what pricing would be in either location, with accuracy.
PS: you've posted a MacBook/Pro inquiry into the standard MacBook ASC;
your model is not generally addressed here, btw. -- A host may relocate it.
In any event...
Good luck in this matter! 🙂