Overcharge on cellphone Insurance

Very poor service from Vodacom insurance. They keep messing up with my insurance and now when I need answers because they are overcharging me, I am being put on hold for long periods. The one agent even dropped my call I guess because she didn’t have answers for me. The other agent tells me that I must calm down, very poor customer service. This back and forth has been happening since last year 2024 when I took cover. They changed my cover without my permission. They called to reinstate and now they are overcharging me for their wrongdoings. I will not accept that kind of treatment.