in this case, just if you know, is there an easy way to contact them? is there an app or something with the big miners?
Sites like this: pushtx.btc.com .
The cost of these isn't cheap and judging from the value of your transaction, I doubt you would want to spend on such accelerators (cost of one transaction can easily go up to 0.007BTC). Anyhow, if you're not in a hurry to get it confirmed, you should just wait for it to confirm in a few days.