not charging

Hi, I have an iPhone 5s and I purchased an MFi certified cable from Amazon last year (here is a link to the specific cable) and it had been working perfectly fine until this weekend and now it will not charge my phone. I get the message that pops up about 'this cable or accessory is not...

My 2014 macbook pro will not connect to mine (or anyone else's) iphone without damaging it by charging on and off rapidly. I have taken to the apple store and was told that it's just because the USB ports are too powerful on my version of macbook, am i correct in thinking that is bs...