GS uses several aggressive mail solicitation companies to send you multiple pieces of junk mail every month. They get paid for each one they send so have no inducement to STOP sending them.
I gave up trying to be nice and believing their 'Oh, we'll stop sending those' lies when I called and just started to collect all their mail, stuff it in ONE post paid envelope and sent it back with my name front and center and 'NO' written wherever a signature was required.
Took months, but they finally got tired of getting those thick and heavy mailed returns that THEY paid for and that never generated any income and gave up on me. To my great relief. Oh, and my great satisfaction too. Kind of enjoyed giving it to them after I'd tried to be nice.
This is the only method of getting GS to stop sending you tons of junk mail. Despite what their reps or emails say.