I am sick of complaining and not getting help

I sent a complaint through about Fedhealth and the fact that they are sending me incorrect membership certificates as well as my end date for my membership is incorrect, but they promist to call back to resolve this and they dont, am now having to complain again, because of this my family wont have medical aid cover: I requested Fedhealth to cancel my medical aid as I have to go onto my new employers medical aid, Heinz said that if I mail him proof that I am required to go onto my employers medical aid, he would cancel my medical aid effective end April, I emailed all the proof to him, then I get a membership certificate stating that my medical aid only cancels end of May, even after I was told that if I send proof that my medical aid will be cancelled effective end April, I logged onto Fedhealth and wanted to get assisted by the chat line but they are useless, I also asked to be given all my membership certificates as I changed members, and I was given only 2 years of memberships, now it will look to the new medical aid like I had a break in membership,