Upgraded contract, no cellphone received

Dear MTN could you please pay more attention to your customer service and phone delivery, my mom upgraded her cellphone contract via telephone and your partner sumersun mobile on the 16th of April, phone was not delivered to her and sent back to MTN head office, again I had to phone them to resend the cellphones as she is to old to do so herself, on Monday the 20th of may I got through to summersun mobile and they said it would be ordered again and gave me a tracking number for the parcel, surprise surprise it does not register on DSV couriers and I also phoned them today and they also cant find the tracking number on their system. I want this sorted out as soon as possible or you will be losing 2 clients thats been with you for over 10 years.