Having problems with entering my codes

I have 8 code numbers and one bottle cap to put in and the first 2 keeps saying they have done been used and I know I haven't put them in and the 3rd keeps saying theres an error, it took 3 other codes then said done did my quota for the week, you have changed this site to worst, was so much easier before and no problems now nothing but and cant find anything like before, I really liked saving these codes and getting a gift for buying your product now I feel like Im wasting my time and is unappreciated as a customer...