Cannot cancel policy

Goodday<br> <br> Ive sold my car on the 28th of may 2015, from the 29th of may ive been trying to get hold of momentum to cancel my insurance, ive emailed with no response after ive sent my requested ID number, ive called in today and waited a long time , being put from department to department, the guy i spoke to said he would call me back, as i mentioned that im paying for this call, oh well that didnt happen, this is the Worst insurance company!!! The lack of communication is pertetic!, i want to cancel my insurance from the 28th! But you dont want to assist.... i will write up a report to the ombudsman stating that this is the second time im having problems with this company for lack of service when needed