Collapsing service at Vodacom Cellular Network

I am an old Vodacom customer with multiple cellular phone numbers. Their service declined drastically of late. I even wrote a complaint letter to their complaints department if they have. I tell you, there was not even an automatic reply. Their network connection recently is worse than any other network operator. Having exhausted all avenues I'm left with this option to try to get some attention from Vodacom . It was even worse when I requested to be transferred to a senior consultant or official I was told nobody senior available to listen to me. Lastly when I insisted to get their head office number, I was given and invalid landline number. Vodacom what is happening? Or rather is it only to me this is happening ?