Turkish Airlines: great in-flight food, not-so-great customer care

In the last 12 month I’ve had 20 flights with Turkish Airlines.
The food was always nice and I’d say that it’s the best available in any airline at least as far as economy class is concerned.

It’s more than 15 years that I don’t fly business hence I can’t comment on the current food level: in the past Iberia was great while Alitalia and Lufthansa were nothing to write home about.

Too bad that the customer care for the frequent flyer program is not at the level of the food.
I’ve compiled the module in the in-flight magazine several months ago, taken the tear off card and started to register the related number at check-in time.
Given the long time without news from the program I tried to register the card on the website, but it’s not possible: I only can get a new card number when registering.
I wrote an email to milesandsmiles@thy.com asking for support 1 month ago: no answer at all.

Today I’ve tried dialing the customer care: there it is no way to register the card I’ve used so far.
Nor to get the flight moved to the number I already got from the web.
A new account was created and the flights have to be added one at a time; and some of them appears to be already registered but it’s not clear if this is referring to the paper-only number or to the Miles&More account that I also have.

After 35 minutes we were only at flight #2 and the rep asked me to send in the boarding cards.
Guess what? I have not kept them after the flights.
Line dropped.
Morale dropped.
No smiles.