Can’t order anything online, says credit card not processing

I’ve been a loyal customer of Cricket for 7 years now and every time I try and order a new phone from the website I always have trouble. When I ordered 3 phones in March the issue was that the address I was using and address of card don’t match up. I was talking thru chat and finally got it to work somehow. Most of the time I have to go to a store and buy it that way. So this time I’m trying to add my son to my plan and the same thing happened. I even tried my boyfriends card and it says that his card isn’t valid but yet he has used it ordering stuff online all the time. You guys really need to get this figured out cuz I’m sure your losing customers and I’m not going to keep dealing with this. At this point I might as well pay more for phones and service thru your competitors to have to deal with this hassle. I know I’m not the only one with this problem and I have contacted Cricket on Facebook but got blown off. Figure it out your I go elsewhere.