Four Seasons Heating & A/C

Air conditioner repaired yesterday, stopped working within 24 hrs, called office since 345pm, tech not working, asking for more money if needs to come
Tech presumably repaired air conditioner on 6/30/2014, charged full amount $270. AC stopped working on 7/1/2014 less than 24 hrs. Called tech, who said he need another 150 dollars if need to come back( even though he made a statement yesterday that if any problems within 30 days, has warranty, by mr [redacted]). On my 4th calling to the office, office staff claims now it is outside working hrs(5:19 pm) and won't be able to help.