Scraped serial number

Unfortunately, I also only now - I have purchased the product in November - noticed that the serial number was scraped and pasted. In addition, the value table has been pasted.
At first I thought nothing of it, however, captures the extremely Shake to smell when you take him immediately to be - I have already taken about one third of the contents to me at the beginning of the stench has not occurred.
When the shaker does not wash immediately after consumption, the stench is almost unbearable.
The product also comes - as it was already described by some others in the reviews - from Hungary.
Is taking a health hazard? Amazon refunded the purchase price?