Decline review

On Sat13th Nov, as I opened my Vodacom app, an ad popped up for a Black Friday special for 300GB data at R299pm on a 24 month contract - apply now. I did this, received a confirmation. This was followed by an email advising they would do a credit check, then advise. Following an email advised me i was declined. Monday 7am i call customer services, very helpful lady advised that i had been declined but could not tell me the reason - she would contact me after 8am - 8.01 she kindly did call transferring me to the relevant department. They could not help me, needed to call *** after 9am - this I did later in the morning - they could not help me - then transferred me to a 4th department - who left me listening to music for 10mins. I have a right to know why it was declined. I have been a Vodacom customer for approx 20yrs. 2mths ago I renewed my phone contract for another 2 yrs Why suddenly am I now declined this contract.? I hasten to add, I have never missed a Vodacom payment. My only other credit reference is a Platinum credit card! Please, understand my frustration after trying 4 departments, no-one can help of advise - totally unacceptable especially to a very loyal customer who has 2 contracts with you and my husband is with Vodacom!🤬