I recall having read something similar elsewhere, might shoot an e-mail to the council anyway in the hope it might pressure them into sorting the road out if nothing else.
First look if the street has red or yellow lines. If the former, the street is TfL's responsibility. If the latter, it would be your council. Both TfL and councils have street fault reporting mechanisms. Best report it there.
If it was a ridge, was it perhaps near a bus stop, and caused by buses?
I recall having read something similar elsewhere, might shoot an e-mail to the council anyway in the hope it might pressure them into sorting the road out if nothing else.