Ah, the ol 'die and blame the medics' routine. Works nicely doesn't it?
If you die, and its even slightly questionable whether or not you want to respawn, don't request medic. Hitting request medic is on you. It's a risk you take. Seven mins after you request, you are able to respawn. Here's a tip for you, if you reach that seven min point and still haven't been picked up, you don't have to hit request medic again, in fact, maybe that option should be removed.
Anyways, whether or not you hit request medic again, the medic can still see that you need picked up, and you have the option to respawn readily available to you, should you so chose, as long as you don't hit request medic again. Now, you are claiming you sat there for 15 mins after hitting request denial.. Due to the above mentioned mechanics, I find this hard to believe, or hard to blame the medics rather.