Unhappy with Vodacom

I have a contract with Vodacom , i'm experience bad service with Vodacom firstly was this caller ID where i was suppose to pay R10 per phone of which is included on debit order every month because the phones where R199 a month including this caller ID now my instalment went up to R225 a month, few months later i end up paying R243 then i enquire that with Germiston branch only to find out that my kids did airtime advance , i cancelled that in February this year 2020 now i recieved the monthly invoice it says R265 that is suppose to be debit this month so instead of me paying R225 it went up to R265