BAD SERVICE

I ordered a new Hard Drive for my Dell laptop on Monday 27 July 2015. Devika promised me I will have it in 2 to 3 working days. On Wednesday the 29 July 2015 I emailed to follow up. She called telling me I will only have it by 13 August 2015. In the same call I requested to cancel my order. After 30min on the call, she confirmed my ordered is cancelled and my credit card will be refunded in 2 weeks time. On Friday 29 July 2015 I get a email stating my Hard drive has been shipped and I will get it in a few days. What happened to Cancelling my order? my Laptop is up and running again. I went to a local supplier and got it fixed. I always heard how good Dell is. this is the most pathetic service ever. i demand my full refund and they can keep their Hard drive. then not to mention how many times i had to tell this lady my details on the paperwork is incorrect when she sent it on Monday. and it was never changed. i need to hear from Dell ASAP!!!!!!