A320 First Officer reported numerous delays during the day was caused by MEL non compliance and confusion over procedures. The aircraft was turned over to Maintenance for action.

Narrative

Aircraft X. We arrived at the aircraft for our departure from ZZZ when we began working through the multiple MELs. MEL 21-XX-XX-X was discussed and we could not locate the logbook entry required before each flight. Maintenance was notified and Contract Maintenance performed the test and logbook entry. We then had a Blower Fault ECAM which was prohibited per the MEL. Contract Maintenance came back to the airplane and the test was performed again clearing the Blower Fault. We had failed to notice that per MEL 21-XX-XX-X there was a note stating MEL 21-XX-XY must also be applied. This MEL was not on our paperwork. We arrived in ZZZZ and had coordinated with Maintenance Control to have Contract Maintenance there to perform the test. We received the Blower Fault with the test and Maintenance began troubleshooting the issue. Circuit Breaker AE02 was pulled and collared and the Mechanic stated this was not appropriate for MEL 21-XX-XX-X. The Mechanic worked with Maintenance and cleared the Blower Fault; pushed the Circuit Breaker in; and made a logbook entry per the MEL. While we were flying back to ZZZ we began researching the history of this further. There had been multiple transfers from MEL 21-XX-XX-Y to MEL 21-XX-XX-Z and finally the night before our flight to MEL 21-XX-XX-X. We believed this is where the Circuit Breaker issue was probably missed. As we dug into this we also noticed the note to apply MEL 21-XX-XY (which was nowhere to be found on the paperwork or the logbook). We notified Dispatch and Maintenance of needing to speak to a Maintenance Supervisor and the Chief Pilot on Duty upon our arrival. The Captain made a phone call to the on call Chief Pilot and Maintenance to bring the issues to their attention. Contract Maintenance met us on the aircraft where we handed the aircraft over to them.