Hi [NAME]  welcome to this user to user discussion forum. This is not Dell Support.  Hopefully purchase paid by credit card and there is evidence (email etc.) that Dell are playing hardball. Submit claim to credit card company and request full refund. 
l ordered a M15 R3 at the beginning of January and had it delivered mid January. I received a return authorization Jan 25th and dropped it off at Purolator that weekend Jan 30 or 31st. It Feb 8th. At this time March 31/21 I have received 155.00 back. Dell was great when I put the order in. It was New Years so there was not anyone at customer care for four days. I wanted to upgrade the screen but they said the order couldn't be changed after the holiday and offered me a 180.00 credit which is more then the option cost.  I appreciated this but at no time asked for a credit.  I have phoned a number of times and been told the the return was approved and awaiting funding etc. Still no money and more calls on hold etc. Today they were looking after it again and I asked to speak to the supervisor as I have heard this before and wanted some confirmation. Everything was settled and I was put through to the supervisor - after a couple of minutes waiting the connection was lost.  I also have been shopping for a 17" and  received a quote. I asked for an adjustment by email to lower the extended warranty period to cut cost. No response and sent another email today. I received a response and sales clerk said they had been off for personal reasons but would have an answer in a few minutes. That was over 6 hours ago. Thanks for reading 
M15 R3, return completed but less then 10% of cost refunded -