Vodacom incorrect billing

Disappointed how Vodacom is treating us as thier customers, November was owing R8591 and made arrangement to pay off my account and vodacom advanced thy won't open my lines until all payments are done. Started paying 30 November, R2000, Dec 19 R2000, Jan 30 R1000 and 6March R500 and was left With R2988 and when I wanted to pay that, the My Vodacom app shown that I owe R4494, been calling vodatlcom they said they will escalate to back office until today it's not resolved. Called today again and Ref: *** my account no I***7. The agent assisting me said Vodacom reopened my lines on the 26 Feb and billed me R758 and R962 and closed them again 1March. Hence my bill went up to R4494. My question why did vodacom open my lines for 3days without my knowledge and closed them just to add a bill to my already owing account. Why didn't they stick to our agreement of me paying off my debt and reopen my lines when I paid everything. Why open 3days and didn't even use my lines just to bill me. I want to close this account as agreed and I would have already paid the remaing R2988 but now am stack because vodacom decided to add to my bill. Please fix this issue.