Merc SA, completely heart broken by lack of after sales service.... why buy a merc if there is no customer experience post contract drying?

I am beyond disappointed in Merc. On 12 Jan, i received an sms from Merc advising me my maintenance contract would be expiring, reply UES or contact Merc Century City to discuss options. I immediately rep**** YEs, waited and waited and waited, 26 Jan i again rep**** Yes .. waited, waited, waited, waited, so i called Century City, there is one person who can help, i left my mobile number. He called when i was in a client virtual meeting, so i didnt pick up, left a voice message, to ring him back, I did, i call back, he isnt available, I left my details. I waited I waited, I waited, I called again, he is off sick ... so i send Merc SA a FB Messenger chat - no response, I sent another 1 March, no response, 2 March a response to email them instead. I email them and wait and wait and finally i get an email back from Dineo saying call Merc Century City, to which i rep**** as per my original email, they dont come back to me ... crickets ....