Extremely unhappy with the service

I have a Debicheck set up for Mobicred. Twice Mobicred did not deduct the money even though there was money available. They have locked my account to purchase, which is fine for me, however I keep on paying and the amount is not getting greater, I have made at LEAST 5 payments of R1400.00 but my account still shows balance of R3000.00. 5 payments of R1400.00 the account should be on R7000.00, where is the other R4000.00. After I complained about this, I am now locked out of my account so I can't even see my balance, but yet I must still pay R1400.00 per month!!!!!!!!!!!!!!!!!!!!!!!!!!!! They tell me I made more purchases, how??? My account was blocked, so who is making the purchases? Mobicred are ****mers and *******!!!!!