vodacom are total ********

vodacom are total ******** - i received a call today that my existing contract has ended (actually it ended in June already) and that as one time special offer - but needs to be done before 24h00 today - i can transfer to a "RED"contract for the same price for double the amount of data. I smell a rat - what's the catch i ask no catch #s/he# says .... I investigate the package options online. The same package for 4gb of data - note 2g anytime + 2g night time (so basically only 2g usable) is going for R79 x 24 months vs the R299 they tried to **** me into agreeing to over the phone. beware beware beware - and NEVER agree to upgrading over the phone