Disputing and eft deposit. WHY?

This company has a habit with even disputing deposits made. I made five deposits of R1000 and used their EFT function for the last deposit thinking there would be no hiccups and to my surprised they said they have paid the deposit to my wallet, but knowing with all eft deposits an sms is send. I have never received the sms nor the deposit. I have sent them countless prove of my banking details even account confirmation letter which I found very odd. I just don't know why YESPLAY is given us all this issues. Please help, as I have been waiting for my deposit to reflect in my wallet for over 24 hours and counting. They said they are reviewing and deliberating and whatever else to justify that they credited my account but in reality they have my deposit in their account and are not willing to credit the money to my wallet.