There are several 'transaction accelerator' services such as this one:
https://bitaccelerate.com/ that you can try, or if you're a tad more tech savvy you can try rebroadcasting your transaction with a higher fee, assuming it hasn't been confirmed yet. Regardless, the fee should not matter as long as the sat/byte value is high enough. I wish i could give you the values but I'm not really up to date on that info. I've sent transactions (using segwit addresses) with feed as low as 30 sat/byte and have had no problems having them confirmed recently.
for replacing the transaction, i'd do some searching along the lines of 'how to replace-by-fee with <x> wallet' on google and start reading. I haven't done it myself, so i dont think i'd be of much help in the matter.