Poor customer service

I had an account with vodacom, i lost a sim card. I struggled to do sim swap. I did not make payments as i was not using the packages. They referred my account to MBDA which called me and advised me i have to make arrangement to pay off an amount of R1000. I made five payments of R200 for 5 months. 3 months later after my payments i receive acall from them telling me my vodacom account has an outstanding balance of R1000. I asked for statement and they send me a picture which was not opening. I call them asking for apdf statement and yet nothing from them. I asked to speak to team leader but that was not possible. Initially they were calling me on mmy mom phones until we made those payments as per the arrangement. Now they are contacting myself on my phone but they failed to do so before we made that R1000 payments. Vodacom did not even contact me to let me know that my account was with mbda. I went to vodacom last year prepared to pay my account fully, and was told the account was not with them. The balance was 800 and something. Now i have to pay 2000 for outsatnding balance of 1000 and not getting any statement on what is happening.