Can I Give Medicare Part A Back?

I’m under Soc Sec Disability (osteoarthritis).
Because of this, I was given wasn’t even asked, just
"Here - It’s yours - free! Want Part B? you’ll be able to buy that. Want it?’
“Um. no. I’ll stick what I have (individual PPO)”

Now, because of that eligibility, I cannot get the discount under ACA rules.
Can’t get Part B until 7/1/14.

Meantime, I’m facing a $150/ rate hike from my current insurer, and have close to $700/mo in drug cost.

Can I renounce my current Medicare eligibility and pick it back up on my 65th (next July).

Yes will go down to SS in person, but figure this is a good source of facts.

Thanks