Incompetence on multiple levels leading to unresolved issues

Fifteen years after I left Vodacom as a customer (*****ulent charges on their part due to incompetence, eventually acknowledged but never reimbursed), I decided to retry them and took out an LTE contract. Their LTE has been exceptionally inconsistent and for the last two months I cannot even read emails most of the time. I raised an issue on hellopeter; they initially responded but it appears that they've been trying to contact me on my old (nonexistent for more than 10 years) email address even though I registered for the new contract using my current email address. This is likely doe to more incompetence during registration of the new contract. I told the contact person about this in my hellopeter complaint but they have completely ignored me. Issue remains unresolved and I have never received any communication from them regarding my contract.