Inconsistent and inconsiderate customer care

I’ve had a parcel with RAM for the past week. Every time they’re out on delivery, they send an sms stating delivery will be made between 8am and 5pm. The first day, I couldn’t receive it because there was no power and I had to leave the office which I notified them about. The next 5 days, the drivers were calling me well after 5pm to tell me they are on their way to deliver when I specifically told them I would not be at work after 5. There is no interest in assisting me. I called to make arrangements to o deliver before 12pm on Friday and they agreed and yet they still called me at 17.30 on Friday afternoon. Worst service I’ve ever received.