President Vodacom

For the last couple of months vodacom has debited my account to the value of R1985.36 by what I thought was to be correct only to find out that my actual invoice states otherwise with the amount of R1661.08. So last month I reversed the debit order for means of vodacom to call me and sort this out nope just sms and robot calls.So I tried to call them myself but for the last 4 years we ( my mother and I ) have tried to get into vodacom head that this is my number and I pay for the phone from my Bank Account and that I have authority to be told whats going on on the account but everytime they need to verify with my mother that lives in a area where signal is an issue. Yesterday she called them and told them that I will call today to sort this out... Just to get told that they need to call for authority again the Vodacom Consultant called from her own cellphone and my mom didnt pick up as she doesn't know the number and with ****mers and all not even I will pick up then I get told to not call again and rather go to a vodacom shop to sort this out. That I will over the weekend. But now my account is up with R3976.72. My calculator tells me there is a massive difference between R1661.08 and that amount but then again if our previous president couldn't count mabey vodacom is the same. Hopefully someone will call or email me about this issue and get it resolved not paying another cent before I am not refunded for all the years mistake debits. Apologies if there is any spelling mistakes.