Refusal to release payments

I have an online account with Li****a Technology and Telecoms for national lottery betting. I had a winnings balance of R3107 and on Monday, 11 May 2015 as per the rules sent an sms to 31792 requesting a payout request for the amount of R3000 and furthermore I submitted a signed letter requesting withdrawal for the same amount. Immediately my online balance was at R99,50 but the funds were never paid to me until today.<br> On Tuesday, 12 May 2015 my online balance was credited with my winnings from the weekend of 09 and 10 May 2015 of R840 that left the new balance at R938,50. I then submitted a payment request for the amount of R600 which to my surprise the funds were paid to me on Wednesday, 13 May 2015. I then followed up on their contact centre at [Email Removed] to query about the first request of R3000 but got a response from Thato who claimed to have not received the signed letter of request. I then attached the letter and forwarded to him/her at [Email Removed] /*** and copied [Email Removed] Since then I have sent 4 more follow ups and I have received no response from anyone. This has frustrated me.