Please get back my money!!

I called December 2019 to hear when is the correct time to cancell my contract at vodacom, because it expired on 13 Febr 2020, and im stayning near the Botswana border and here is no Vodacom signal! They told me i can phone in January, so i called in January and cancelled my contract with vodacom! They told me its now cancelled and the last payment will go of the 1st of March, then i will be on prepaid! The 1st of April another installement went of and i phoned them! No one can help me, and i phoned again and again! I called and ask to speak with a supervisor, he Immanual from JHB phoned me back and i explained my situation, he told me that they will pay back my instalment of R 632.98. From the 1st of May im suddenly on prepaid they took all my data and airtime and they took R582.99! What must i do know! They stole my money! R632.98 and R582.99! Can u, hellopeter get my money from them please?