The Argentinians certainly had 4 Roland SAM launchers ( a short range tactical SAM) some of which went to Port Stanley and were captured by the UK, Oerlikon twin 35mm cannon with Skyguard radar system, they also had a number of 20mm Rhinemetal RH202 cannon and SA7 (not sure where those came from). I'm not aware of the Argentinians operating any medium/long range SAMs.
Their air defence forces were mainly Mirage III C/D, the only medium range A-A missile available was the Matra R530 which were quite long in the tooth even by 1982 and when used operationally failed to perform. I found this Argentinian ORBAT for 1982, though I have no idea
http://www.aeroflight.co.uk/waf/americas/arg/AirForce/Argentina-af_historical_orbat_1982.htm