I had two contacts that were same person but different email addresses I deleted one to combine them. Then your system would not let me change the email on the remaining contact to the correct email of the deleted contact, saying it still existed (even though I had deleted that record). A search proved it didn't exist.
So now I am screwed. Your system has a bug. FIX IT so I can get my data correct.
I founded a software firm in 1981 that still exists today. Do you test your software before releasing it on an unsuspecting user?