Courier that doesn't deliver

On two separate occasions has this courier been inefficient and slack.

On the first occasion, it took them 2 weeks to deliver a sim card ordered from MrP on the premises that the phone was unanswered when they phoned.

Second occasion, I ordered a customised phone cover. Again, on the premise of an unanswered phone call, my delivery was extended. And yet, I PHONED the courier back within 30min and confirmed my address. Today I receive an email from them stating they cannot reach me to confirm my address. When I voiced my irritation, I was told the agent did not log the delivery (whose fault is that?) and they have no proof of me returning the call (proof I will happily supply)

So apparently after one miss call, they cannot "get hold of me"? I wish they'd be more persistent like the banks and cellphone companies since not EVERYONE can be on or with their phones 24/7. Now I will apparently receive my parcel tomorrow (I can hope) but I will never deal with this company again. Their agents are useless and full of pathetic excuses.