Disappointing Service (or lack thereof)

I have 3 contracts which were due for upgrades. I called the contact centre and was offered the upgrades I wanted and agreed to on all the contracts. The consultant I spoke to was Precious. I was assured everything was processed and that the devices would be delivered within 3 business days. When I didn't receive anything, I called in again and spoke to Bornwise. He checked the system and informed me that the upgrades were not captured and as a result, only the 2 upgrades could be done, but as the 3rd one was after the 7th of March, the combo deal was no longer available. I was not happy and asked him to escalate, as the calls are recorded. Again I never heard from anyone and called Bornwise after a few days. He checked the system again and said that it should that the query was resolved and I accepted a device. I informed him that this was not true and that he needed to escalate again. Another few days passed and I tried calling in again, only to find out that my number had been blocked, due to an influx of calls into the call centre. I had to use my husband's phone, just to get through and spoke to someone else this time. The consultant issued a query and issued me with a reference no. ***. She informed me that the matter would be investigated and I would receive a call from someone thereafter. That was on the 11th of March and to date, I've not heard a word! This is beyond disappointing! I've been a client for more than 15 years and expected better. There's no client service or accountability. Everyone seems to be passing the buck and not having a conversation with me. Also, as a client, how am I to raise a query if my number gets blocked??? Ask yourselves - why is one client calling in so many times? Surely that should be an indication that service has not been rendered and requires attention. You don't just block calls because you cannot deal with the query efficiently. I gave a 1 star rating, but in reality, this deserves no stars!!! Please attend to my query and contact me in order to resolve the issue.