NEW TWISP COILS A WASTE OF MONEY

I purchased 2 boxes of TWISP coils a week ago. There are 5 coils in a box (10 in total). I am sad to say that it has been a week and I am on my 6th COIL!!! I know how to use my TWISP and have been using it for almost 2 years now. The new coil's fiber is shorter (probably so they can get more coils per meter of fiber) and they just do not work. This is R400 worth of coils!!! The first 10 or so pulls are great. After that the flavor gets super bland and within the day, all that is left is a strong plastic burn taste that gets stuck in the back of your throat. It gets so bad that I have no option but swop out the coil with a new one which unfortunately, does the SAME thing!!! Please contact me to resolve this issue. THIS IS A WASTE OF OUR MONEY!