Poor service and delays in the process

I wish, that I could change from Discovery as a service provider, but sadly I cannot. It has taken Discovery over 3 weeks (starting on the 18 Aug 2018) to just retrieve the invoice from my doctor in order to make a payment. Which they still have not done. It took countless phone calls and and going between the doctor and myself to get the invoice and actually send it to discovery (sent on 4 Sep 2017). Why, you ask? Its because Discovery has been requesting the information for the wrong person, even though the forms are clearly in front of them. Then you have to wait for one accounts person (Leah) to make a payment. For a company the size of Discovery, you have person that can make a payment baffles me. Second, she gives a dumb excuse, that she didn't get the invoice and only received it the day I sent it. Which was a lie, because the doctors office CC'd me in the e-mail (was sent on 25 Aug 2017) . Then changed her tune when caught out to say, they sent it to the practitioners payments department. Then promised to load the payment on the 06 September 2017 and it'll paid by 7 Sep 2017 and in the doctors account on the 07 Sep 2017. Guess what, still no payment made and Leah can't be found for comment. So basically after wasting all my time, discovery just really doesn't care, because every person I asked to phone me back with feedback never did and not a single person could give me a straight answer. All i want to do is add my wife to my policy and I followed every rule to the letter. yet Discovery found ever reason not delivery on there side of the deal.