Hi and welcome.
As you don't say what sort of seal needs repairing on what sort of window, e.g. casement, sash, double glazed, my best suggestion for now would be to buy some polythene sheeting from a garden centre and duct-tape it over them to the outer frame. (An old fashioned DIY double glazing method, lol.) It'll keep the draughts out for now.until you know what the problem and remedy is, and thus who to get to fix or replace them.
PS: Simon Hart advertises on here who seems a good all rounder, so could try him: