Sorry about your negative experiences,
I had a similar experience regarding the with-holding of funds from the builders mortgage. I didn't take out the builders mortgage having arranged a better rate of interest from an outside source, however, on the completion day my mortgage company advised me not to sign anything until KeyMare had repaid ALL of the monies outstanding on the property. My solicitor said that this was normal practice in Spain, but my mortgage lender was having none of it!! We walked away from the table at the Notary and more than four hours later (after many frantic phonecalls) the money was fully repaid and the deal went ahead, I have been told by another owner that KeyMare did repay the monies within two weeks when a similar thing happened to them.
Regarding the air-con working on heat......have you checked that the control is showing a sun instead of a snow-flake? I know that they look very similar, and it is rather obvious, but I have made the mistake without my glasses on!
Hope this helps and that things work out for you,
Regards to you and yours,
Lorraine Braid. Apartment 12-3-07.