Dont want to end my contract

I bought a contract phone on the 11/01/2016, apparently my last payment according to Vodacom was supposed to be on the 20/01/2018, which for me was the 25th payment, after a long fight with Vodacom and a complaint e-mail( which no-one responded to it) I gave up and paid that last invoice for January 2018 on the 20/03/2018 with a penalty fee of R100, so in total I paid R388.00 on the 20/03, as given by a consultant at Vodacom shop in campus square, Johannesburg, I then called Vodacom to confirm if the account is closed on the same day 20/03/2018, I spoke to a lady who said to me there's still outstanding amount of about R300 for February/2018 invoice, I asked her to investigate thoroughly I'll call back later, indeed I called back after 16h30 on the 20/03/2018 I spoke to Kamogelo who confirmed that account is settled and closed, she confirmed that my last invoice was in January/2018, she confirmed with her supervisor to my surprise I received sms 11/04/2018 from Vodacom that they'll cut my number as I owe them, I called ********** spoke to a guy can't remember his name, on 11/04/2018 around 10H15 -10H30 who confirmed that the account is settled, but the phone cut off as we were busy talking, I phoned again on the same day between 13H00 and 13H45 spoke to Nqobile who said there's still outstanding amount of R302 she said its a cancellation fee, I dropped the call phoned again, I spoke to a lady and asked to speak to a supervisor, I spoke to Ashwin Ebrahims he said that the R302 is for February/2018 invoice, I told him what his consultants said, he said to me he can't answer on their behalf I must take what he's telling me I'm so tired of Vodacom consultants and their supervisor Ashwin Ebrahims who are so ***********, how can 5 consultants talk a different language? aren't they supposed to be using same system? I'm asking you to thoroughly investigate this and resolve this matter as soon as possible, it was the 1st time I took out a contract with vodacom and its for the last time, so is everyone closed to me family and friends, I would hate it for someone I love to go through the same trauma I went through hopefully this will be resolved to my satisfaction, if not I'm taking this further. Icasa will resolve this for me because clearly you dont take your customers seriously