MRP constant problems woth paying online.

This is about the third time I have had issues with paying for an order online through MRP. My order of 664.90 I have been trying to pay for it for 3 days now. First when I tried to pay with it with my two vouchers and the rest in cash it wouldn't work because it can only take one gift card, how stupid is that? Then I was told I could not pay for the order in cash in the store so that I could use both my gift vouchers on the order, MRP used to have the option of paying in store and now has taken it away and made life very difficult because I had to cancel my order and try to pay for it once I had to phone them to combine my gift cards so that I could use it to pay for my order. So now 3days later two of my items have gone out of stock and when I tried to pay for it with my gift card and the rest with my MRP account it tells me there is no available credit with the facility, when there is clearly enough money to pay the remainder. So sick of all these problems with MRP you need to fix your ******* online payment options and process. Still unable to place my order due to the incompetence of MRP.