MTN - charges you for an upgrade AND reduces your monthly data allocation

FIRSTLY- MTN contacted me to do an upgrade. Two months later I got charged approximately R230 as an administrative charge, they charge you for an administrative process and did not advise me up front. SECONDLY - My contract is for 100 minutes and 4Gs monthly - they changed it to 1.5Gs per month. If this is'nt daylight ******* I don't know what is......