Price increase - mid contract

Email received from Vodacom 26 March advising me that my Smart L subscription is increasing, as well as sms on Monday 30 March to reconfirm the mid contract increase. Phoned contact centre and spoke to March Makhurupelasi at 09:58 who advised me \this is how it is". My 24 month contract expires May 2016 which I signed up with Nashua Mobile who was taken over by Vodacom. I asked to speak to a team leader and held on from 10:01 to 10:12 before speaking to Daryl Govender who claims to be a TL. Daryl promised me that he will take it higher. I requested him to send me my contract by COB Monday"