VODACOM HEADOFFICE BAD CLIENT SERVICES

My contract expires 1 April 2018. I was at a store before 1 April and was told to return for upgrade only 1 April nothing earlier. I returned on 1 April but Vodacom Head Office was not able to upgrade me due to the VAT implications. The Frontpage deal Samsung S9 on SmartS @R699x 24 plus 1 Gig data x 24 months was advertised until 2 April. I was told in store that they could not help me until today. Today the deal does not exist, and I need to take another dealt which costs me more for less. I was on time for upgrade as informed by Vodacom Head office, but Vodacom Head Office could not meet my need. Could Vodacom Headoffice contact me for the Deal as is was advertised on the booklet as it is not my fault if the systems was not working.