SHOCKING SERVICE-AWAITING REFUND SINCE MARCH

I took a 100GB connecta deal over the phone with a Cell C sales consultant. the first week in Feb 21. It has been an endless nightmare because no one at Cell C ever calls you back nor do they ever advise on when a case is closed and what the outcome is. The idiot who did the sale agreement did not apply the discount to my account as the amount was R389 p/mt. They ended up deducting R1907.56 off my account. I have been calling Cell C since the 10.03.21 with no joy but they were quick enough to deduct the incorrect amount.I have been waiting for a refund of R1397.97 since the 10 March. I am so frustrated I don't know what more to do. I have called Cell C on the following dates : 10,15,16,17,30th of March. April=6th,12th again on the 12th, 22nd,23rd. May=4th 11th 13th x3 times and still nothing. Case numbers received: ***; ***; ***; ***; ***; ***.I was informed that the it wasnt a credit I wanted but a REFUND as they had taken my money I don't want a credit. I have had contracts for years with Cell C but I am now going to cancel all of them. Disgusting service after all these years of never missing a payment!!!