Inconsistent debits from beame, messing up my budget. Consultants not picking up my phone.

So I have a tracker contract with mix telematics matrix beame. The agreed monthly amount to be paid via debits in Black and white of the contract is R120. So now i was debited R151 but last month it was R120. Was the something that was added without me being told ?

Firstly when I purchased the car I was told that the beame contract is included in the invoice. I was surprised when I received debit order but I was told it was included in the contract. I kept quiet, now you are pushing it again and hiking my debit order which was not supposed to be there in the first place.

I called this morning and held the phone for like 5 mins without speaking to a consultant. Please address this and return my R31 and my debit stay standard at R120 before I escalate the matter externally.