New premium membership issue.

I have been using this app for literally years, and recently due to cancelling another subscription app I decided to allocate that money to this app going forward. I just got the 6 month subscription to premium and after purchasing it went through to my card but it immediately said (server error) despite charging me. I have hit Restore Purchases and it either hits me with (server error) again or loads infinity until it says (timed out) either way. Not sure how to deal with this. Am I supposed to wait for it to recognize the purchase? Or was it supposed to work immediately and something's wrong?