Dissappointed due to bad customer service from a retentions agent at Cell C

I have been a client for the past 7-8 years with Cell C and through all this time I have never had any problems with my upgrades. Now I call last week Thursday and a lady by the name of Nadia assists and tells me of the deal for that day only and I was prepared to go for it on my upgrade. Then she advises that my credit score has not been uploaded. it will take about an hour and she will call me back. That was last Thursday, today is the 23/04/2019, I have called four times, been transferred and the call is cut with a message saying "the number you have dialled does not exist. I have left messages with various call cente agents in the retentions department and Nadia has not called. The last consultant advised me that "maybe your upgrade was declined and only she can help you"

Huh???

I am stunned, dissappointed and angry that after all my years of loyalty, this is what i get. Cell C is not the problem, their lack of s****ed agents is what they should address. POOR SERVICE from employees is what give a company its bad reputation. I am strongly considering ending all three contracts I have with Cell C.