Tablet pricing/ stock and poor service

I have a contract with Vodacom for over 20 years and i am very disappointed at the level of service received lately to do a add on to my existing contract. I wanted to add the Lenovo M10 tab to my existing contract but this proved to be a challenge with regards to stock availability and pricing. I went to Vodacom in Cresta and they had no stock. Game Cresta under Vodacom contracts had a price of R179 on offer over 24 months whilst Vodacom had it for R199 over 24 months. This is disappointing to have 2 different prices yet under Vodacom contracts. Vodacom 4 U in Cresta managed to order stock and i did the add on but at R199 per month as they could not get the same price as what Game has although under Vodacom contracts. It took me over a month to get this order done based on stock. The other thing that is frustrating is that i only wanted to add on a device to my existing contract but i still had to pay Sim & connection charges and take on a data contract for the device which i did not really want. Vodacom should allow customers to just be able to add a device on their existing contract and be charged handset only costs accordingly!