Worst Service Ever

For the last 6 weeks we have been trying to update my wife's details so that she can reset her password and change her credit card to discovery bank card. Also so that she can log into the Discovery Health website as well. We have been sent from pillar to post, promised it will be resolved but nothing. When the OTP is received (on the correct cell number) it just gives the following: "The ID number you provided doesn't match what we have on record for this cell number" and then says contact Discovery for assistance. I have contacted you guys 10 times now in 6 weeks. I have sent several mails to complaints@discovery but their service is even more pathetic! I need this resolved asap.