Cancellation of Vodacom contract

I have had two contracts with Vodacom for at least 20 years and have always maintained a good credit record. My husband passed away on 27 September 2025 and one of the contracts, although in my name, was exclusively used by him. The contract on his phone expires in 2027 and Vodacom are happy to cancel the contract at a cost of R3000 for the instrument which is 2 years old. This phone is lying in a drawer, unused, and yet it is accumulating an account for the contract bringing my account with Vodacom to +/- R800 per month. I have approached Vodacom management on this issue and they claim I cannot cancel the contract no matter what the circumstances. I have provided them with his death certificate to no avail. Having been a loyal customer for such a long time, I'd expect more urgency and effort to be given to this matter as I am in my 80's and work half day. On 26 February I received a sms from Vodacom saying there was R434.21 due on my account. I paid R450. I then received another sms saying thank you for paying your account and I stupidly thought all was in order. I have not received an invoice for months! Today I received a message saying there is an amount outstanding on my account and upon calling Vodacom was told there's an amount of R880 outstanding on the account! I have requested an itemised invoice as I feel this is much too much but their accounts dept can't provide me with that as the account is in arrears. Remember that my 2nd phone has been lying dormant in the safe since my husband passed away. I asked the consultant whether I could please speak to someone regarding this issue. I was referred to Customer Care who cannot assist me as the account is in arrears!!! I'm beside myself with frustration at all this red tape and now find myself with a bill of +/- R1600 as a "promise to pay" on 25th March! This is the outstanding R880 and R800 for March - how do they know it's going to be R800 for March is my question! Has anyone ever been able to cancel a cell phone contract with Vodacom ever? Even with a death certificate to prove that he is no longer needing the phone I'm hitting a blank wall with Vodacom and will be going onto pay as you go as soon as possible