Car hire return to Alicante airport

Hi - my husband is due to return tomorrow the hired car we have to Alicante airport (from goldcar but booked through do you Spain) then was supposed to collect another hired car (again from goldcar via do you Spain). We contacted do you Spain but they told us we have to speak to goldcar directly. We have now contacted them several times since last week and are told that someone will call us back - no one has. We also got an email address and contacted them but again no reply so far. 
My questions  are - has anyone had to return a car to airport during lockdown (unsure if allowed to)? Then if car hire desk isn’t open to collect replacement hire car is there taxis at airport even if there are no flights around the collection time? Otherwise my husband has no idea how he’ll get back home. 
We have also tried to call Alicante airport but couldn’t get through. 

Many thanks in advance for any advice.