You can not have both Gigspot & log in to individual companies with the same email.
You are now at the mercy of Gigspot, contact them to request a cancelation of your Gigspot account.
Then if you really want to use Gigspot every now and then sign up with a different email just to view available shops & log in directly to a company site to apply/ complete work.
Fyi there are a lot of **glitches** with Gigspot that make it a pain in the @$$ to use anyway.