Lack of assistance

My husband passed away 16 Dec 2017, almost 3 years now. Gone to MTN Pavilion a couple of times - they can't help me to transfer the account onto my name. I have been paying the debit order since the start of the contract. Was told to contact "Legal" on 135, which I did. Was given a number, ***, Deceased Dept - number doesnt work!! They told me I need to have this done at a MTN branch/store. In emails backwards and forwards, still no success in changing this contract into my name. In the meantime the contract was upgraded. Instead of paying +-R200, I am paying +-R900 now - never received the "new" device". Shocking to say the least!!