Debit order increase. (unhappy)

My debit order is all of a sudden gone up by R250. and nobody call tell me why. Contract was taken out last year November 2019 for 2 devices and was paying my fixed debit order until July 2020 and my debit increased. Cannot get hold of contact centre and emailed numerous times I get sent pillar to post with no joy. Eventually was advised that's its my insurance and I must contact them. I was also advised that from customer care that I am now paying for 4 policies and I should only be paying for 2 policies. The mtn insurance department said they ony only pick that I have 2 devices and I must call the customer care again. So my question where is my money and why is my debit gone up. I would like a refund on the R250.Nobody seems to know why. So they are making extra money at my expense. Very disappointed with Mtn and I have had a contract with them for many years. I will never recommend them to any one. They take your money nicely and with no explanation.And the worst part is that they can't tell me why.....