Hello this has happenned several times to several owners.
Iberdrola will take their money from your bank, if there is not enough funds the bank dont pay and Iberdrola remove the meter.
To get it re-instated takes weeks? they dont respond very quickly. Most people go to the Iberdrola office in the port and sort and the owners i know ended up on holiday with no electric until the last few days?
The water company do the same if there is not enough funds. But they will re-instate water meter same day on payment of 50€ reconnection fee.
You can ask your management company to try to solve but it may require you taking your previous bills and sorting. One owner had a tiny baby with her but it did not make Iberdrola connect any quicker?
Problem with Iberdrola is they take their money every 2 months but it is difficult to predict there is no set date each time sometimes its only 6-7 weeks betwen bills othertimes it 8-9-10 weeks?
Some people forget when various standing orders are taken, and mis calculate the funds in their Spanish bank, this may not be your case but it usually is?
There is a slim possibility that your meter was taken in error? this happens with the Water ones but have not known it with the electric meters.
There are many threads on this forum about these if you search the forum
Also they take payment then send the bill?