Ozymandias gave you the absolute correct answer.
Adv the Throttles as needed just forward of CLB detent till back on VAPP, then return them back to CLMB detent and everything "managed again"
Or pull the Speed knob and increase speed to "selected" for the auto-thrust to increase THR to the new selected speed.
You can also disconnect the ATHR, and be careful you are clear with that procedure or it may bite you.
Airbuses are not dead busses, they tend to scare pilots which are not proficient on the stated procedures in the FCOM/FCTM.
I have flown both 320 & 767 and like the both, they are just different and the airbus is less forgiving on "sloppy pilots" period.
Last edited by A320 CURSED; 15th Aug 2015 at 20:24.
Reason: typoe