still waiting for certificate

I have enrolled a call centre management course on 2012 with IQ Academy, which consisted with 16 modules and pay for 2 years. I passed some of the modules and they asked me to re-write the ones I failed. I did as the way I was told and found competent on all the modules. After that I was accussed of not paying on january 2013. Then they sended me a message that I will receive my certificate within 2 weeks but still today I received nothing from them. When i have to think about the money that I have paid, it pains me because my hope was on that certificate.