Shocking service

I paid for credits and sent the proof of payment for this to the accounts department on Monday and 4 days later the credits were still not loaded on our account. When I sent an email to Charlotte Seaborne in the accounts department as well as to the general accounts mail I get no response. I then today have to follow up again to beg for credits that were paid for 5 days ago to be loaded. When I get through to Charlotte she interrupts me and tells me "yes well I have not gone through my emails yet" and that there is an issue on their side that no one felt the need to address or get sorted out. Poor customer service from her and her complete lack of enthusiasm or professionalism when dealing with a Client. Not the first issue I have had with MIE and their lack of service or professionalism from staff.