Fibre not working, Account paid in full, wont fix fibre until account name changed, Users cant work!!!

I recenly purchased a guest house with fibre managed by MWeb. We have been trying to transfer the account since early Nov 2021 but MWeb have a problem of not being able to identify/separate the email addresses/services of the previous owners at their personal residence even though that does not show on the Guesthouse invoive but on a separate invoice. So when there is a tecnical problem, they dont resolve it and insist that I must speak to Customer Service to change the account ...Vicious circle.... and REFUSE to let me speak to management as that state that Management cant do anything! Why are they called managers if they cant manage problems that their staff dont understand? The 1st time the fiibre was down in Nov 2021, they said they would send a technician which NEVER happened.