Once again I need to complain

Your claims department does not give good service. I submitted dentist claim to discovery 30 Nov. Received confirmation of claim immediately and received partial payment on 4 Dec. Full amount was not reimbursed, as according to Discovery, codes were missing. I contacted my dentist for correct codes and resubmitted 7 Dec, reply reads claim will be attended to in 2 working days, a week later still no payment, so resend claim on 14 Dec, 3 days have passed, still no payment. I am a pensioner, chose an expensive option and pay membership fee timeously monthly, least I can expect is to get reimbursed timeously too. To me this reimbur*****t is a huge amount, which I need in order for my budget to work out.