Disappointing 'service'

I am absolutely disgusted with the lack of service from a so-called International company. My parcel arrived in the country on 1/11/2015 but I was not contacted until 4/12/2015!! Why is it that you had to wait until this was escalated to your Swiss division before I was contacted? I missed a call from your office on Friday, and received an email with a number to call back. I was on hold for more than 10min with no answer. Debra Ramaboya called this morning, i queried why it has taken them so long to contact me, and she mentioned dates that they apparently tried to call, yet I have not received one missed call on my phone on those dates mentioned. It eventually came out that the first time they truly tried to call me was 4/12/2015! more than a month after the parcel arrived in the country. In addition, my parcel was sent to the state warehouse yesterday as it was not cleared by customs. Explain to me how you regard this as International standards of customer service?? Utterly disappointed with DHL, and not surprising as this is not the first time you've messed up. I work for a Swiss company that regularly uses DHL, but I have to advise against using DHL for South African deliveries