Terrible communications trying to follow up on a paid order

I paid for and placed an order with this business on 4th May valued at over R3000. I was quoted 10 working days for delivery from date of order. On receiving no follow up by 19th as to delivery date etc I tried endless times phoning Bob Shop as well as the seller Technology Unlimited on their listed phone numbers to obtain either tracking details or an ETA. When I did get through which wasn't often the person I spoke with said they would check but never came back to me whilst holding the line for 5 minutes and more. On other occasions I got through to Bob Shop but on each call they said they could not hear me even when trying calling them from different phones. I smell trouble in dealing with both Bob Shop and Technology Unlimited and would advise others to exert caution in buying on line from them.