Refund taking forever after cancelling my policy

I cancelled my policy on the 13th March 2015, and was told by the dispatcher that i would receive a notification of the cancellation as well as be credited immediately. I have been phoning every day since and i have left about 5 messages for someone to phone me about the fact that i have not been credited. My car left my possession on the 11th March 2015. I was told by a senior manager that the entire system has crashed and therefore they couldn't pay any money to anyone who had a policy with king price. I was then told i would have my money by Friday 20 March 2015. I have just phoned again and spoke to Mark, who has flagged my query as urgent and said i would only get paid by 12 o clock tonight. This is unacceptable!!! The customer service is non-existent and should you be having technical issues with your systems you should not be answering phone calls as you cannot help anyway! Absolutely disgusting! I am absolutely livid as my concern is that i will be debited by the end of the this month, as no one can confirm the cancellation of my policy, the amount to be credited back to me, or anything!!!