Coin Master complaint: Not giving stars

For weeks I have been trying to resolve an issue with coin master not crediting stars
The first time it happened they owed me around 800 stars , the stars were added then taken off.
I emailed to be told the stars had been taken off because they basically had gone on twice, they had not.
Couple weeks later same happened again, this time around 400 stars.
Having had this happen before I watched the star count go up, it reached first 100 then took them off.
I reported this issue once again to be told they didn’t owe me stars and that the case was closed, I asked for address and phone number to complain and after having asked them a third time they informed me no address or phone number was available , only email and they said the case was resolved, it is not.
I asked how it had been resolved and as of yet have had no reply.
I have paid a lot of money over the months and in my opinion have paid for the stars I won.
All I was asking was for them to add the stars to my account.
The customer service is terrible and hope you can help in this matter .
Thanking you
Sue