3 Months delay on installation

I paid for installation on the 1st September 2022, I was informed that my installation will occur within 48 hours, after 48 hours i was informed within 14 days after 14 days i was given MPT 51296 and informed that within 4 to 5 working days Ill be contacted for installation, 5 working days are over however no contact has been made whatsoever, calling your client services is pointless no one answers and if they do they hang up, emails are not answered and the whatsapp chat is useless all they do is give a new mpt number for the same issue, what else can I do to get assistance?