Vodacom ambush marketing , ********* and devious

I Recharged with r110. airtime yesterday , and got a sms from vodacom saying..''VODACOM HAS GIVEN YOU R220. BONUS AIRTIME , WHICH EXPIRES AT 23.59 ON THE SAME DAY'' , Wow i was impressed , but should have known better , there is no free lunch with vodacom...So i phoned my kids , when call was finished , i check my balance , R50 taken off my aIrtime purchased , and not off my so called bonus airtime , i phoned service provider and was told that bonus time is only for vodacom to vodacom calLs..I was shattered as the sms said nothin about terms and conditions , THIS IS DISHONEST AND MISSLEADING , I am furious with vodacom being so underhanded and devious ,This is ambush marketing at it's worst, and I AM LOOKING FOR ANOTHER SERVICE PROVIDER...vodacom i cannot deal with yr underhandedness and wastin my time , and my airtime. CANT YOU GUYS JUST BE STRAIGHT-FORWARD AND HONEST?