Poor service from DPD Laser

I've never in my life experienced more terrible service! I've phoned 19 times in one week to track 2 parcels. I was promised next day or within 3 days delivery every time. Apparently one parcel was sent back to the company where the item was collected and some of those items are now sold and out of stock, and still they confirmed this parcel to be delivered tomorrow. This was supposed to be delivered before Christmas. Some of the times I phoned they didn't even know where the packages were or had a different delivery address. I'm really frustrated. They are not responding to any mails and I'm in a queue every time I phone them, with no great results anyway. Don't use DPD laser for delivery!